Pens and Pencils | Reviews and Data

Uni-ball One Pen

The Uni-ball One is a gel pen that uses pigmented ink in order to produce clearly writing and water-resistance.

The pen was announced on January 21, 2020 with a set release date of February 26, 2020. That’s a quick turnaround time for a pen from a Japanese manufacturer but it doesn’t decrease from the excitement of this new Uni.

The pen has a cool design, but its main selling point is a pigmented ink which will be sold with a set of new refills in the “UMR” family. The UMR refills are generally seen in Uni’s Signo pens, but to date they have been non-pigmented inks. The pigmented inks have darker colors and water-resistance that normal gel inks can’t match.

Uni asserts that darker colors are easier to read and create writing that is more memorable than lighter colors.

The other cool feature of the One is the open wire clip. It’s essentially a spring-loaded clip like that found on the Sarasa Dry pen, but with a sturdy piece of wire as opposed to a plastic body.

This pen will be sold only in 0.38 mm (model UMN-S-38) and 0.5 mm sizes (model UMN-S-05), in 20 and 10 color options respectively.

The retail price of the Uni-ball One is is 120 yen.

Uni-ball One Pen Information

Street Price Check Price
Manufacturer Uni
Pen Type Rollerball / Gel
Barrel Color White, Black
Barrel Material Plastic
Grip Color White, Black
Grip Material Plastic
Country of Origin Japan
MSRP $1.50
Still Sold Yes
Release Year2020
Similar To
Capped? Retractable?Retractable - Top Button
Weight (g)
Ink Color ShippedBlack, red, blue, yellow, orange, green, pink, sky blue, light pink, blue black, royal blue, light blue, mandarin orange, lime green, emerald, baby pink, violet, brown black, bordeaux black, green black