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Multi Pen Versatility: Combining the Pilot 4+1 Multi Pen with the Uni Style Fit Gel Refill

August 20, 2025

When I had ordered these Pilot 4+1 Multi Pens, I knew that they used the exceptionally good Acro ink BVRF-9 low-viscosity refill. I was NOT aware that Uni’s Style Fit gel refill uses the same format, and therefore fits this pen. For today, I wanted to do a quick post showing off this feature because I love when multi pens are versatile enough to allow you to use both ballpoint and gel inks at the same time, and the contoured grip on this Pilot makes it not only versatile but extremely comfortable to use.

Here, you can see that I have taken one of the blue Pilot 4+1 pens and swapped in two .5mm Style Fit refills in Mandarin Orange and Blue-Black. The Acro Ink and Style Fit refills are exactly the same size and shape, allowing you to choose from among the 16 Style Fit gel colors in addition to the Acro Ink set.

The Acro-Ink Refill (left) alongside the Style Fit (right). Note that the Style Fit and Pilot BVRF-8 refills DO NOT fit Uni 4+1 Multi Pens, as these use a shorter Jetstream Refill. It’s also excellent but just a different format.

Both the Uni Style Fit and Acro Ink refills provide a smooth writing experience. Of course, the edge in smoothness and color saturation will go to the gel pen, but Pilot’s Acro Ink deserves a place among the best ballpoint refills on the market. We added one of these Pilot multi-pens to our most recent Patreon Curated Box, and received a ton of positive feedback on the stock refills so these will be a shop staple for as long as we can continue to get them. (They are imports.)

From top: Pilot Acro Ink in black, Uni Style fit in blue black, Pilot Acro Ink in red, and Uni Style fit in Mandarin Orange.

Takeaways and Where to Buy

Personally, I favor the Pilot 4+1 body over the Uni Style Fit Meister 5, though both are good. The contoured wood grip on this Pilot Multi Pen is among the most comfortable I’ve used, and I was thrilled to discover that there is a gel refill I can pair with it that offers .28mm, .38mm, and .5mm options in 16 different colors. (Just to be clear, the reverse is also true - the Style Fit body will take the Pilot refill.)

The Pilot 4+1 Multi Pen (Top) next to the Uni Style Fit Meister 5 (bottom). I prefer the Pilot’s grip, but the Uni does come in nearly a dozen different colors.

You can get the Pilot 4+1 and Uni Style Fit Multi Pens in our shop, along with the refills for both. As noted above, the Pilot 4+1 ships with four .5mm Pilot BVRF-8 refills (black, blue, red, and green, plus a .5mm mechanical pencil). The Uni Style Fit bodies are sold separately from the refills, so you can assemble your own customized pen.

Come see these pens in person! We are open this week from 1-6pm Thursday and Friday, and 10am-6pm on Saturday. Check out this page for up-to-date hours and news on special hours when we have to travel.

In Multi Pens, Pens Tags Multi Pens, Pilot Multi Pens, Uni Multi Pens, Uni Style Fit, Pen Review
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