Pen Review: Is the Uni Zento Gel Pen Worth the Hype?

One of the most-discussed releases of the past year has been the Uni Zento gel pen, which has captured the attention of the stationery communities in both Japan and the U.S. In particular, the “Zento Signature” - which features a cap as opposed to your typical retractable mechanism - prompted rushes reminiscent of the Uni Kuru Toga Dive mechanical pencil. While I’ve yet to get my hands on one of these “upscale” models for an extended test drive, I’ve had the opportunity to write with both the standard Zento and the slightly upgraded “Zento Flow” (both retractables) for a couple of weeks now. While I’m not sure I would pay more than standard retail for any version of this pen, the Zento is an excellent gel pen and so far I prefer it over the Uni One and any of the basic Uni Signo “office” inks.

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The Uni Zento Flow Gel Pen in the Jade Colorway, in-hand. I also went with a Canary Yellow standard Zento.

So What’s the Story Behind the Zento?

Uni’s gel pen lineup can be confusing - the company has released multiple iterations of your standard black/blue/red gel pen and left them all on the market simultaneously, the only difference supposedly being different inks that to most people will seem quite similar. The Zento is advertised as formulated for “stress free” writing, which apparently refers to a combination of smoothness and cushion. The Zento is indeed quite comfortable to write with - the pen feels very smooth with little to no scratch, and the ink glides on the page and dries instantaneously. The ink is also advertised as formulated to reduce feathering and bleedthrough, and I can confirm there is none. Now was this actually so much of an issue with Uni’s other pens that it warranted an entirely new product line? I’m not sure, but it doesn’t change the fact that the Zento is good.

Ink Comparison: Zento Black Ink (top) has a more matte look, vs. the glossy black Uni One (bottom). To draw a comparison to fountain pen inks, I’d compare the Zento ink to something like Platinum Carbon Black or Sailor Kiwa-Guro, while the Uni One ink is more of a glossy black like Aurora.

How Does the Uni Zento Compare to the Uni One?

As I noted, in addition to the Zento, Uni released the Uni One a few years ago, which was supposed to be another “specialty” ink that’s a step above your standard office gel pen. I’ve found the Uni One and the Zento to offer somewhat different writing experiences, so I can confirm the distinction is real. The One contains an ink formulated to be extremely dark (standard black) and/or vivid (other colors), with a glossier finish. So if you prefer a darker, wet look to your gel ink, you might prefer the Uni One, especially if you’re using the pen for drawing or doing layout work in a bullet journal or planner. The Zento seems better suited to pure writing, as it lays down a remarkably smooth line and, in my opinion, has the more comfortable barrel.

Update: You can now view the Uni Zento companion video review on our YouTube Channel!

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The array of barrel colors available for the Uni Zento standard. There are some great colors available.

Takeaways and Where to Buy

Uni makes a great gel pen, and I surprised myself with how much I enjoyed the Zento as I don’t typically do much writing with gel ink beyond quick notes and annotations. I strongly prefer the barrel on the Zento over the One and pretty much any other standard gel pen - it’s got a nice balance, the perfect diameter for my hand, and on the standard model, a soft texture that’s comfortable over longer sessions. I will also say that the clips on both the Uni Zento and the Uni One are excellent - the wire design is highly functional - with the slight edge to the Zento as it feels a bit tighter on both the standard model and the Flow. That said, if you prefer the barrel on the One but want to try Zento ink, the Zento refills fit the Uni One, and vice-versa.

We currently have a large selection of the standard Uni Zento gel pens available in our shop, as well as a smaller selection of the Zento Flow, with the upgraded barrels. Zentos are priced at $3 and $11, respectively, with extra refills available for $1.75. You can get a nice pen at a reasonable price, or pick up a refill that will fit one of your existing Uni pen bodies.

Come see these pens in person! Visit our shop, currently open Thursday and Friday 1-6pm, and Saturdays 10-6pm. Check this page to keep up to date on our current hours, which may change depending on travel schedules during pen show season.

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You can tell the difference between the clip on a Zento (top and bottom) because it has the round holder, whereas the holder on the One is rectangular.

New Arrivals: TWSBI ECO "Serpentine Bronze" Pre-Orders Are Live; Pens to Ship This Week

TWSBI’s latest release is the second ECO in their mixed-color series, “Serpentine Bronze.” This new pen features a gorgeous mix of green and bronze/gold acrylic paired with TWSBI’s bronze-tone trim. Colors are mixed during the injection molding process, so no two pens will be the same and each will feature its own unique pattern of swirls. The Serpentine Bronze ECOs are priced at $51.99, and available for pre-order today. They should arrive this week and will begin shipping immediately. If you missed out on the first round of mixed-color ECOs, we have the “Amazonite” green and white version in stock as well. Be sure to check out our entire range of TWSBI Fountain Pens, Pencils, and Inks!

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We are an authorized reseller of TWSBI products. Come see these and more in-shop, as the Serpentine Bronze ECOs should be in the store by the weekend! We will be open this week from 1pm-6pm Thursday and Friday, and 10am-6pm on Saturday. Be sure to check the shop page for up-to-date hours.

Diving Deep: On Exploring the "Back Catalog" of Established Brands

People frequently criticize established brands such as Lamy and Pilot for not introducing new products at a rapid clip, but what they overlook is the extensive back catalog of existing products that these companies have developed over decades, including dozens which don’t receive a lot of hype. Entire product lines have been ignored for so long that I was unaware of them despite nearly a decade as a blogger in the stationery world, and it was only after I opened a retail store and gained access to the full catalogs and pricing sheets that I somewhat shockingly “discovered” a treasure trove of great options that many people don’t know exist. These are excellent products that should receive far more promotion, not just by the community but by the manufacturers themselves. My observation is that most of these fall into three categories: multi pens (subject to the most egregiously unfair treatment), rollerballs, and mechanical pencils.

The Lamy CP1 Twin Pen (right) shown next to my vintage Lamy Unic (Thanks, Jim!)

Multi Pens: “Tri Pens”, “Twin Pens,” and 4+1 Options

Is ignoring multi pens a U.S. thing? Did the proliferation of low-quality multi pens in the U.S. market during the 1980s and 1990s spoil the category for most people, outside of dedicated Japanese stationery aficionados? Apparently Lamy, Pilot, and Uni all have deep lineups of multi pens in their back catalogs, but with very little presence at U.S. retailers. I find this surprising given the enthusiasm among my own readership and customer base for multifunction pens, especially those slimmer models that take nonproprietary D1 refills. I took a flyer from Lamy on three multi pens that I had never used before: the Logo Tri Pen, the CP1 Multi Pen (both Twin and Tri versions) and the ST Tri Pen. All of these are exceptionally good, and I’ll call out the CP1 Twin Pen as my personal favorite of the three. The matte black finish and squared off clip are reminiscent of the Lamy 2000, and I like the slim design. Fun note: Gerd Müller, designer of my beloved Lamy 2000, also designed both the Lamy CP1 and ST series of pens. All of the multi pens take the D1 refill so you can customize them with the gel or ballpoint refill of your choice.

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The Lamy Swift in the Special Edition “Black Forest”. Did you never hear about this one until a year after it was released? Me neither. I just got mine yesterday.

Rollerballs

Many people (including myself) had essentially written off rollerballs as overly wet, gloppy writing instruments that tend to bleed through every type of paper and offer very little variety in terms of writing experience. There are some excellent rollerballs out there, however, including the Ohto Ceramic Series (CR01 and CR02), as well as the underappreciated Lamy Swift retractable rollerball. The Ohto Ceramic Rollerball refill is one of the best “capped” rollerball refills I have used, and with modifications (i.e., a spacer) it can even fit into the Lamy 2000 Rollerball. The Lamy Swift is a retractable rollerball with a cool design feature: when you depress the knock to extend the refill, the clip retracts into the body of the pen. This not only gives you the comfort of a clipless pen - no clip digging into your hand - but it prevents you from accidentally sticking the pen in your bag or pocket with the tip extended (and ruining fabric).

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There is no better $4 mechanical pencil than the TWSBI Pagoda. I’m confident of that.

Mechanical Pencils

Ok, so it’s probably not fair to say that mechanical pencils go “overlooked”. There are vibrant online communities solely dedicated to pencils (woodcase and mechanical), but for much of the stationery community mechanical pencils don’t receive a lot of attention. Personally, I think it’s because apart from the Uni Kuru Toga Dive, companies haven’t innovated all that much over the years, and most of the excellent mechanical pencils on the market have been around for a while. (In some cases since the 1960s, like the Pentel Sharp Kerry. If you’re interested, I did a review a while back looking at the Kuru Toga Dive and Sharp Kerry side-by-side.) In addition to the Sharp Kerry, check out the TWSBI Pagoda ($4, really?), and the gorgeous Pilot S20 at 1/4 the price of a Kuru Toga Dive, which is a great pencil but I would question whether it’s worth the current U.S. asking price.

And because I will get a dozen comments/emails asking if I don’t do this, the pens are, from left: TWSBI Pagoda, Uni Jetstream 4+1 Lite Touch, Uni Jetstream 4+1 Standard, Uni Jetstream Lite Touch 3 Prime, Lamy CP1 Twin Pen, Pilot Acroball 4+1, Pilot E95s fountain pen (because it IS underappreciated), Pilot S20 ballpoint, Pilot S20 mechanical pencil.

All of the pens and pencils discussed in this post are available to enthusiasts if you dig around enough, though sometimes U.S. retailers have to import directly from Japan, especially with some of the more uncommon mechanical pencils. While new product releases can be fun, I don’t get my stationery thrills from special and limited edition releases, but rather undiscovered (to me) gems that many people have been using as their everyday writers for years. Personally, I find many of the “innovations” in recent releases gimmicky, and would prefer to concentrate my efforts on raising awareness of existing products that are well made, that meet the needs of most people, and that I want to promote and support so that companies will continue making them.

Do you have a long-term favorite stationery item that you think tends to go un- or under-appreciated among stationery enthusiasts? Drop a comment below or send me a note. As you know, I’m always looking for new products to explore, and yes, we are still growing our own shop and looking for unique stuff that nobody else carries!

The Gentleman Stationer is supported entirely by purchases from the T.G.S. Curated Shop and pledges via the T.G.S. Patreon Program. We will be open this week from 1pm-6pm Thursday and Friday, and 10am-6pm on Saturday. Be sure to check the shop page for up-to-date hours.

Workhorse Pens: Vanishing Point or Decimo for a Capless Fountain Pen?

A handful of iconic fountain pens appear on everyone’s “you-need-to-try-it-at-least-once” list. The Pilot Vanishing Point is one of those pens. Not only has it been around since the 1960s, making the original design approximately the same vintage as the Lamy 2000, but after all these years it remains the default option for a retractable nib fountain pen.

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I did a review of the Pilot Decimo several years ago, so I won’t go into the nuts-and-bolts details again. I will, however, spend today’s post talking about 5 specific things to understand about the Vanishing Point and Decimo, including what I consider to be key differences between the classic VP and the slimmer Decimo, and how those differences have impacted the pens’ functionality for me over the years. The purpose here isn’t to say that one is better than the other - it’s purely a matter of preference and what will work for you based on how you hold and intend to use the pen. Both pens are the same price, after all, so it’s not a question of saving money by going for one as opposed to the other.

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No, this “Harvest Green/Yellow” color isn’t available anymore. And no, my pen is not for sale. :)

Vanishing Point vs. Decimo: 5 Considerations

• Both Pens Use the Same Nib, Cartridge, and Converter. Since the Pilot Vanishing Point and the Pilot Decimo use the same nib units, ink cartridge, and converter system, you can experiment with both pens without worrying that your parts and accessories will only fit one or the other. This also means that you can easily move nib units between pens, and purchase additional nib units for more versatility without accumulating additional pens that you won’t use. As an aside, you can check out this short video showing how to install a cartridge in both pens. (They work the same way.)

• The Decimo is Slimmer. The Decimo is lighter weight and slimmer than the Vanishing Point, which means that it will fit many people’s hands better. This is purely a matter of personal preference, since the pens otherwise function in the same manner and use identical components, as noted above.

• Both Pens Feature the Same Clip (But Consider…). One “controversial” aspect of both the Pilot Vanishing Point and Decimo is the clip placement. The clip necessarily has to sit on the nib end, since the pen must be carried nib-up, but some find that it interferes with their grip due to finger placement. This is yet another matter of personal preference, but I tend to find the Decimo more comfortable because the slimmer barrel alters how the clip fits in my grip. (And, yes, you can remove the clip entirely, but understand that it will void your warranty.)

• The Decimo Fits More “Pen Loops,” Including on Plotters. One reason I absolutely love the Decimo is that it fits my Plotter pen loop and in most other planners. The extra-fine nib writes well on most papers, regardless of quality. This makes it a perfect “planner pen” for me.

• The Vanishing Point Comes in a Wider Range of Colors. If you’re looking for matte black trim or the iridescent “carbonesque” finishes, you’ll be limited to the Vanishing Point model. That said, Pilot periodically releases Japan-only Decimos in gradients and other unique finishes, though you may have to pay a premium.

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A comparison between Vanishing Point/Decimo nibs (top) and the E95s nib (bottom).

TLDR Version: Pilot’s retractable nib Vanishing Point and Decimo Capless fountain pens are the best version of the “Retractable Nib Fountain Pens” product segment. Over the years, I’ve gravitated towards the Decimo, since a slimmer pen better fits how I use retractable fountain pens, but I do own and use both. As you can see from the photos, I’m also experimenting with the E95s, which is not retractable but highly portable, and which also features an excellent inlaid nib that’s the spiritual successor to the Pilot Myu.

We currently carry select models of the Pilot Vanishing Point (Matte-Black Trim and Carbonesque) and Decimo, with most nib sizes available in pens and as separate nib units. If you enjoy our content, we are entirely self-supported through our online shop and physical store, as well as the T.G.S. Patreon Program.

The Jetstream Is THAT Good: Hands on with the Uni M17 Lamy Refill

It baffles me why Uni’s Jetstream Ink still hasn’t caught on as the default ballpoint pen ink outside of Japan. For those not in the know, the Uni Jetstream is the original “hybrid gel” or “low viscosity” ballpoint pen, which combines the smoothness of a gel pen with the write-anywhere capability and quick-dry features of a standard ballpoint. For me, the Jetstream has everything you would want in a refill: It writes a dark, solid line. It flows well. It dries nearly instantaneously and does not smear. Importantly, it works reliably in a range of tip sizes, from .38mm all the way up to 1.0mm. Yet we are still largely forced to import pretty much everything other than standard disposable Jetstreams click pens from Japan, despite Uni manufacturing a multitude of different refill formats that fit not just Uni pens but third-party brands.

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I have new and vintage Lamy ballpoints, and the M17 refill works well in both of them. Shown here is the Lamy Unic (“Unicorn”? - now discontinued), as well as a standard Safari.

The much-publicized, Japan-only 2025 release of the Uni Jetstream M17 ballpoint refill - designed to fit M16-compatible Lamy pens, merely reinforces the absurdity of this situation. Look, I don’t mind the standard Lamy M16 ballpoint refill. There may have been some spotty QC years ago, and the current version is quite good, but it remains a standard ballpoint writing experience that’s never going to rise above the limitations of that technology. By adding the Jetstream ink, the M17 refill improves the writing experience significantly. But as with other Jetstream formats, there’s still no indication that this refill will be consistently available to markets outside of Japan. In the Japanese market, retailers now have a Safari Ballpoint option with “Jetstream Inside”, i.e. the Jetstream refill is included with the pen. Yeah, that probably won’t happen here. But I hope I’m wrong. :)

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Many love the black Jetstream refills for their solid black line.

Takeaways and Where to Buy

I won’t beat the Jetstream drum any more than I already have. I especially love the Jetstream Multi Pens - mainly because they’re the way to get colors other than black - and Uni recently released an even smoother Jetstream ink (the “Lite Touch”) that some believe outperforms the original formulation. Most of my personal pens that take Parker-style refills now use the SXR-600, and my Lamy 2000 Multi Pen (4-Color Ballpoint) has long held the SXR-200 D1 refills. I’m a bit worried about falling too hard for the M17, because I don’t know how stable the supply will be given the current trade situation, but for right now I’m going to enjoy what I have. If you’re a Lamy fan and want to up your ballpoint game, grab some of them if you have the opportunity.

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Only one part of our Jetstream selection!

Our store carries a wide variety of Jetstream pens as well as refills in as many formats as we are able to source. We still have a few Uni M17 refills in stock from the small shipment I managed to source. (Update: These are now sold out.) I'll try to find more, but timing of a resupply is uncertain at best. Stay tuned!

If you’re ever in the Nashville, Tennessee area, please stop in and see us! We’d love to welcome you in store and answer any questions you may have. The Gentleman Stationer is open this week Thursday (1-4) and Friday (1-6) and Saturday from 10-4. Our site is entirely self-supported through the shop and the T.G.S. Patreon Program.