Comparing Low Viscosity Ballpoint Pens: Jetstream vs. Acroball vs. Anterique vs. Ohto

February 8, 2025

It’s been interesting to see pen manufacturers - especially the Japanese manufacturers - move away from standard ballpoints to low viscosity refills. You sometimes hear these refills referred to as “hybrid gel-ballpoint”, because they combine the permanence and quick dry times of a classic ballpoint pen with the smoothness of a gel pen. Personally, I love them, and they form a core part of my own everyday writing rotation. The downside is that outside the Jetstream line, you don’t have many color options, with most companies offering these refills only in black.

Low Viscosity Ballpoint Writing Samples — In order of darkness, I would rank the inks as follows: Pilot Acro Ink, Uni Jetstream, Anterique Mach Ball, and Ohto. In order of dry time, I would rank them the exact inverse: Ohto, Anterique Mach Ball, Uni Jetstream, and Pilot Acro Ink. That’s not to say that any of them “dry slowly,” but with a darker like, you will get more smoothness, and with that added smoothness comes increased dry time because it means more ink is on the page.

With so many of these sorts of pens entering the market, I thought it might be helpful to do a quick comparison of my thoughts on four of the most common brands: Pilot (Acro-Ink / Acroball), Uni (Jetstream), Ohto (various needle-tip refills), and Anterique (“Mach-ball”). See below for my thoughts on each. Please note that this post is not intended to be comprehensive, but rather an overview of the more popular refills that I often get asked about, with a focus on how they compare to one another. For a more general overview of low-viscosity ballpoints, including other brands, see this post here.

Uni Jetstream. Probably the easiest to find of all the refills featured in this post, the Jetstream comes in anything from D1 size to Uni’s own proprietary multi-pen size to a standard Parker-style cartridge. The biggest selling point of the Jetstream is the number of options you have. D1 and multi pen refills come in colors that include black, blue, red, and green, and even though the Parker-style cartridges are available only in black, you still have .38mm, .5mm, and .7mm tip sizes. Jetstreams are smooth writers - maybe not quite as smooth as Pilot’s Acro-ink, but you’d have to be a pretty big ballpoint aficionado to notice the difference.
Pilot Acro-Ink. In my opinion, the smoothest, easiest-writing refill on this list. While Pilot’s Acro-Ink refills aren’t quite as ubiquitous as the Jetstream line, I like them for longer-form writing. The .7mm writes a smooth line without smearing, and in my opinion it’s a better .7mm tip size than the Jetstream. These refills are found in the Pilot S20 ballpoints, the “Dr. Grip” line, and the Pilot “Acroball” pens that you can sometimes find in larger office supply stores.
Anterique “Mach Ball” Refill. Anterique is known for taking the classic vintage-style click pen and upgrading it with their excellent refill. It only comes in one tip size (.5mm), with black ink, but it’s a great pen and relatively inexpensive. Pro tip: you can often substitute one of these refills into a standard vintage Bic Clic ballpoint. I have a large collection of vintage ballpoint pens, and it’s been a joy to give many of them a fresh life with a new refill. Sometimes you have to trim or extend the Anterique refill, as I don’t think the specs on the Clic were consistent over the years, but there are only a couple of exceptions where I was unable to make it work. Anterique’s biggest selling point is that it dries nearly instantaneously.
Ohto Needle-Tip Ballpoint Refill. The ultra-precise .5mm needle-tip ballpoint has become Ohto’s hallmark. Of all the pens on this page, Ohto’s are on the drier side, but what this means is that you will get a very precise line and zero smearing. Ohto makes the refill for Object Index, Traveler’s Company, and Mark’style branded pens. Honestly, if you see any Japanese needle-tip ballpoint pen, chances are it’s an Ohto.

Low Viscosity Ink Writing Sample Pens — Writing sample pens are, from left, the Pilot S20 (shown here in brown), the Anterique Mach Ball Standard Size, the Object Index Cedar Pen, and the Uni Jetstream 4+1 Bamboo.

I’m a huge fan of ballpoints and they play a huge role in my everyday working life because, well, they just work. We stock a wide variety in our shop, and if you come visit us in person, ask to try each of the refills featured here, as we have testers generally available.

Thank you for reading! The Gentleman Stationer is supported by the T.G.S. Curated Shop and the T.G.S. Patreon Program. If you’d like to visit our in-person location, you can view directions and up-to-date hours here.

Pilot S20 Ballpoint in Brown on Leather Background

Workhorse Pens: Pilot S20 Ballpoint

January 22, 2025

The T.G.S. “Workhorse Pen” series is where I park all of my recommendations for those pens that I personally rely on to get work done. While this series started out as exclusively focused on fountain pens, as my interests have become more eclectic over the years, I’ve expanded the series to cover other categories - namely low-viscosity ballpoint pens.

Pilot S20 Ballpoint in Brown and Black Striated Wood

While the low-viscosity ballpoint pen received its own writeup as a category, I wanted to take a moment to highlight an exceptionally good take on the product: the Pilot S20 ballpoint pen. The S20 has been around for a while, in both ballpoint and mechanical pencil format, though like many of Pilot’s best products, distribution has been largely limited to Japan. Featuring Pilot’s “Acro-ink” (the Acroball refill in a Dr. Grip-style cartridge), the S20 stands out due to its unique shape and feel in addition to the excellent writing experience.

4 Different Low-Viscosity Ballpoint Pens — Four different low-viscosity ballpoint pens (well, almost) that I use regularly. From left: Pilot S20, Uni Jetstream 4+1, Anterique Mach Ball in Clear Green, and the Caran d’Ache Infinite 888, which is not technically a low-viscosity ballpoint but has an exceptionally good refill. .

I won’t belabor the benefits of low-viscosity ballpoint ink, because they aren’t necessarily specific to the S20 and I’ve already written about them fairly extensively. To briefly recap, low-viscosity ballpoints are sometimes referred to as “hybrid gel” pens, meaning that they feature smoother ink flow than your typical oil-based ballpoint, while maintaining the faster dry times and increased permanence. The downside? Color selection. I’ve not seen many hybrid ballpoint pens come in colors other than black or blue (and sometimes red and green), as opposed to gel pens, which these days are available in pretty much any color you can think of.

Pilot S20 Grip Section for Ballpoint Pen — The combination of the gently shaped section and the tactile wood used in the Pilot S20 make for one of the most “usable” pens I’ve experienced. It’s honestly the first pen in a while that just makes me want to pick it up.

Why do I love the Pilot S20 so much? For starters, both the top and bottom halves of the pen feature a concave hourglass shape, which allows it to rest comfortably in my hand. While “feel”, “balance”, and “comfort” are highly subjective, in that they often depend on variables like hand size and writing pressure, I personally consider this one near perfect. The wood barrel gives the pen a tactile feel, making it one of those pens that’s a pleasure to pick up simply because it feels elegant - almost extravagant - despite only costing $25.

Pilot Dr. Grip Cocoon Refill in a Fine Point for the S20 Ballpoint Pen — The Dr. Grip “Cocoon” refill.

As for Pilot’s “Acro-ink”, to me this refill feels more gel-like than the Uni Jetstream or the Anterique Mach-ball refills, which have a more tactile feel akin to a pencil. Part of this might be that the S20 comes in a .7mm tip size, but I’ve always felt that Pilot Acroball pens lay down a darker, wetter line than their counterparts. This pen is a very smooth writer, so much that I’ve recently started using it for journaling - something I can’t say about other ballpoints in my rotation.

Pilot S20 Ballpoints in two colors, side by side

Takeaways and Where to Buy

Since I got my hands on the S20 last year, I’ve not taken it out of my personal rotation. The red and black version sits in my Plotter A5 pen loop, and has become an everyday planner pen for me. The brown and black version lives on my writing desk at home. While the Dr. Grip is marketed as Pilot’s “ergonomic” everyday pen, I tend to find it slightly too large. The S20 better fits my own hand and writing style, while keeping the same excellent refill.

Pilot S20 Writing Samples Compared to Other Ballpoint Pens — For writing samples, I used standard Target-brand copy paper, since that is how many people have to use their ballpoints at work, school, and otherwise out in the world. Of the three shown here, I think the Pilot Acroball ink is the darkest, followed by the Anterique Mach Ball, and then the Jetstream. All are very good and I use them interchangeably.

As of this week, we have the Pilot S20 ballpoints back in stock in our shop. We sold through our initial shipment around Christmas, but have plenty once again. A few of you have asked about the mechanical pencil version, and the .5mm is on the way as soon as our supplier has it back in stock. (.3mm will depend on interest, so let us know!) The S20 ballpoint is priced at $25 and comes in two colors: Red/Black and Brown/Black. Additional refills are also available. I’ve checked, and these are indeed the same cartridges that fit the Dr. Grip pens sold here in the states, though these are .7mm “Fine” refills whereas most U.S. Dr. Grip pens are sold with the 1.0mm “Medium”. Personally, I prefer the fine, and will likely try to swap one into my Dr. Grip Full Black to see if it gets more use.

New Arrivals: Pilot Vanishing Point Black and Blue Carbonesque Models and a Fountain Pen Restock

January 14, 2025

Ok, so these arrived before the New Year, but in the rush of the holidays and all the year-end festivities, I completely forgot to get them listed! We are now happy to offer the Pilot Vanishing Point in both black and blue Carbonesque finishes, along with a restock of the black trim Vanishing Point models, the E95s in both burgundy/ivory and black, and all colors of the Pilot Custom 823. As always, if there is a specific color or nib size you are looking for and don’t see, please do reach out as we can easily special order products on demand and have them in the mail to you shortly.

Pilot Vanishing Point Blue Carbonesque — The Blue Carbonesque fountain pen is quite possibly my favorite Vanishing Point finish in existence (other than the maybe the Japan-exclusive mustard yellow).

After last week’s snowstorm, our brick and mortar location is open once again. Public hours are Thursday and Friday from 1-6pm, Saturday from 10-6pm, and otherwise by appointment. We look forward to seeing you this week!

Kaweco Classic Sport vs. AL Sport Piston Filler Fountain Pens side-by-side — Two Kaweco Sport Piston Fillers: The AL Sport Piston Filler (left) and the Classic Sport version (right).

Kaweco Sport Piston Filler Redux: Classic Sport vs. AL Sport Piston Comparison

November 23, 2024

This release took me a bit by surprise. While I did suspect that Kaweco would eventually release a lower-cost version of its initial piston-filling fountain pen, I didn’t expect it to happen so soon. Of course, we’re talking about the just-released Kaweco Classic Sport Piston Filler fountain pen, which arrived Wednesday. Now that I’ve had a few days to mess around with it, I can answer a few of the questions that I received and offer my initial impressions on how it compares both to the standard (cartridge) Classic Sport model and the AL Sport Piston Filler.

Kaweco Classic Sport vs. Classic Sport Piston Filler Fountain Pens — The standard Kaweco Classic Sport (top) vs. the Kaweco Classic Sport Piston Filler (bottom).

Kaweco Classic Sport (Cartridge) vs. Classic Sport Piston Filler

Appearance. As with the AL Sport, Kaweco chose to use the most basic version of the Classic Sport (clipless black with gold trim) as the starting point for the Classic Sport Piston Filler. Capped, you won’t notice any meaningful difference from the standard cartridge Classic Sport other than the gold ring at the blind cap, which you remove to access the piston knob. (The blind cap at the back of the pen prevents the piston from accidentally being turned when the pen is posted.) Uncapped, you will of course see the ink window, tinted grey, which immediately differentiates the barrel on the piston filler from the standard cartridge pen.
Weight. The first thing about the Classic Sport Piston Filler that struck me was the weight - the pen is notably light, with the added heft from the piston only slightly perceptible in my hand. It’s of course much lighter than the AL Sport Piston Filler, but that’s to be expected given the difference in materials.
Clip Compatibility. There is no integrated clip in the Classic Sport Piston Filler. The standard add-on Kaweco Sport clip fits, so you can use that as you like. I personally prefer a sleeker clipless look on the Classic Sport, and if I need a clip on a pocket pen, I usually opt for the AL Sport Piston Filler or one of my Art Sport models (which also feature the integrated clip).

Kaweco Sport Piston Filler Ink Windows — Both piston fillers feature ink windows.

Classic Sport Piston Filler vs. AL Sport Piston Filler Fountain Pen

Overall Aesthetic. The designs of the Classic Sport and Al-Sport piston fillers are distinct, even though the internal mechanics may be identical. Personally, I think the AL Sport Piston Filler looks more upscale, with the curved clip, matte metal body, and greater heft in the hand. Of course, it’s also more expensive, priced at $165 as opposed to $75 for the Classic.
Clip vs. No Clip. As noted above, the AL Sport Piston Filler features the integrated clip, borrowing the same design from the Kaweco Sport Luxe series and the latest collection of Art Sport fountain pens. The clip is a matter of personal preference that often draws strong opinions. If you absolutely need a clip, you can add one to the Classic Sport.
Ink Capacity. Both pens appear to use the same piston mechanism, and hold the same volume of ink. While I’ve not done a scientific measurement, the pistons took in enough water/ink to fill approximately 3/4 of the way to the 1ml marker on a sample vial. So I’ll guesstimate approximately .7ml of ink. This is roughly what would fit in a standard fountain pen converter, and probably more ink than you would get in a short international cartridge and certainly more than in the Kaweco Mini Converter. Piston or not, the Kaweco Sport will never be an “ink tank” fountain pen, but the piston pens hold more than enough ink to get most people through a few days of writing.

Both Kaweco Sport Piston Fillers Posted and Extended — The integrated clip on the AL Sport Piston Filler (left) vs. the standard Kaweco Sport Clip on the Kaweco Classic Sport Piston Filler. The add-on clip is sold separately for the Classic Sport.

Takeaways and Where to Buy

This post contains only my initial thoughts on Kaweco’s latest release - one thing I want to see is whether the Classic Sport Piston Filler shares the same excellent ink flow as the AL Sport version. As I pointed out in my post on that pen, having the ink sit directly behind the nib and feed (as it does with most piston fillers) often leads to heavier ink flow and an overall wetter writing experience, which I’ve always found to be a good thing with smaller nibs like those in the Kaweco Sport series. So far, the writing experience has been quite nice and consistent in both the Classic and AL Sport versions, but I plan to do a longer-term test.

Kaweco Pen Counter in the TGS Shop — Come by our shop and see not just the Kaweco Sport Piston fillers, but also the other new releases like the latest Kaweco Collection AL Sport “Olivine” (shown at left).

We currently have stock of both the Kaweco Classic Sport Piston Filler and the AL Sport Piston filler in the shop. If you’re in the Nashville area, I have two tester pens inked up so you can come by and try them in person if you like. We’ve also just received a major restock of Kaweco Bottled Ink, Kaweco Ink Cartridges, and other styles of fountain pens such as the full-sized Kaweco Perkeo!

During the upcoming holiday season, our store will be open for extended hours. Please check the “About” page for directions and updated operating hours, as well as announcements regarding any special events.

Kickstarter Alert: The Wingback Journeyman Pen

October 19, 2024

It’s always exciting to see U.K.-based Wingback release a new pen! They’re one of my favorite penmakers working with heavier materials like brass and stainless steel, since they pay close attention to the design and balance, with a focus on building pens that are both durable and capable of being used as an everyday writer. Specifically, Wingback pens and mechanical pencils tend to be shorter in order to offset the increased weight of the metals they use. You might think that this is an obvious point, but you’d be surprised at the number of machined pens on the market that end up too heavy to use for more than a few lines of writing at a time.

Wingback Journeyman Pen In-Hand — Introducing the Wingback “Journeyman”!

While Wingback’s latest release, the “Journeyman”, is a touch longer than the existing “Mechanical Pen”, it maintains an excellent feel in the hand and should be on your list of pens to consider if you’re looking for a durable go-anywhere pocket writer. Even better, this new model has customization options previously unavailable.

Wingback Journeyman Clip in Stainless Steel — The new crown/knock incorporates a milled clip.

For those unfamiliar with the Wingback Mechanical Pen, it features a unique “twist bolt action” mechanism that locks down and, with some practice, can be operated one-handed. The Journeyman uses this same style of knock, but incorporates a milled clip into the crown that allows the pen to be secured to a bag, pen case, or pocket. Personally, I also find that the clip makes the mechanism easier to grip and deploy. Wingback has retained other favorite design elements such as the diamond knurling on the grip (neither too sharp nor too slick - just right!) and a comfortable barrel diameter that once again emphasizes the pen’s usability.

Wingback Mechanical Pen and Journeyman Comparison — The Wingback Journeyman (right) is only slightly longer than the Mechanical Pen (right). The Journeyman is shown in a combination of brass and stainless steel, while the Mechanical Pen is shown in Black Steel.

So what differentiates the Journeyman from prior Wingback offerings, in addition to the clip?

Customization. The Journeyman can be customized on a component level, allowing you to mix and match materials. Available in brass, stainless steel, and Black Steel, you can now choose different combinations of metals for the barrel, crown, and clip. The pen I was sent for review features a brass barrel, with a stainless steel crown and clip. A full titanium pen is also available, though you cannot mix and match the titanium components with other materials.
Refill Compatibility. The Wingback Mechanical Pen used a Fisher Space Pen pressurized refill, which is somewhat polarizing as many people don’t enjoy the way that it feels on the page. (I like it, but it’s not for everyone.) The Journeyman offers more flexibility, as it takes an international G2/Parker-style refill. While it ships with a Schmidt Easyflow 9000, you can choose from any number of ballpoint, gel, or even rollerball options in this format.

Wingback Journeyman Internal Components — The mechanism isn’t complex: simply unscrew the knock and drop in a new refill.

Are there any drawbacks to the Journeyman’s design over the clipless Wingback models? In addition to a bit of added weight from the clip and increased length, I should mention that the edges of the milled clip are somewhat sharp, and can snag your hand if the pen rotates while you’re writing. If you don’t tend to rotate your pen, this may not be an issue, but I’ll also add that my pen is a review sample so the finished product may differ as production specs are finalized.

Takeaways and Where To Buy

As with the other Wingback products I have reviewed, I found the quality to be top notch, and fans of machined mechanical pencils and pens will want to check out the Kickstarter page for full details. With two weeks to go at the time of writing, the Journeyman already has received nearly $100,000 in pledges (blowing past its funding goal of $2000), and Wingback has a track record on Kickstarter, so while Kickstarter projects are never guaranteed, there’s no doubt in my mind that the project will deliver. Current estimates have the Journeyman pens arriving in March 2025. Pledges start at £150 (roughly $195), making it a not-inexpensive purchase, but Wingback has always been known for not skimping on the quality of materials or construction.

Wingback Pens: Three Different Options of pens and a pencil — Clockwise from left: Wingback Journeyman, Wingback Mechanical Pen, and Wingback Mechanical Pencil. Check out the patina on the pencil, that’s developed over a couple of years.

If you’d like to read further on other Wingback pens and pencils, you can check out my reviews of the Wingback Mechanical Pencil and Fountain Pen and Mechanical Pen here. Pocket pens are one of my core areas of interest, and I periodically update the site’s “Guide to Top Pocket Pens”, which I also encourage you to visit.

Wingback provided me with the pencil featured in this review free of charge, for review purposes. I was not otherwise compensated for this review. The Gentleman Stationer is supported by purchases through our own T.G.S. Curated Shop, and pledges via the T.G.S. Patreon Program.