Limited Design + Charm by Yohaku x isshoni. Uni-ball One P. This is a pre-order item estimated to arrive by end of Nov/Beginning Dec 2026.

Created in collaboration with Daigo for their isshoni. series—a line of thoughtfully designed stationery focused on enhancing productivity—Yohaku brings its signature aesthetic to Uni-ball’s compact and smooth-writing One P gel pen. Each pen features a 0.5 mm tip with Uni’s rich pigment gel ink.

Uniball One P is a shorter/rounder version of the Uniball One F pen. It is both shorter and chubbier than the original Uniball One F pen. The Uniball One P holds black Uniball One ink in your choice of .38mm or .5mm. Refillable in the tip size of your choice. This is a limited edition color and design. The "Bath Bomb" series for Sabon is a marble blue and white design and color.

Uni-ball One inks are made with large pigment particles so that they stay on the surface of your paper instead of being absorbed into the paper. The inks look brighter and more vibrant because there is no absorption into the paper and they are also fast drying and bleed resistant (no smudges). Made in Japan.

Ink is refillable in 0.38mm or 0.5mm tips. Please note the last photo should Uniball One F pen ink sample - this is the same for this pen Uniball One P (the pen is just shorter and rounder).