Uni-ball One 0.5mm Ballpoint Pen - Black Ink – Black

Write darker, crisper notes with fast-drying pigment gel ink and an open-wire functional binder clip.

The Uni-ball One (UMN-S-05) is engineered around a revolutionary, formulated pigment ink designed to sit directly on top of paper fibers rather than absorbing deeply into them. This unique formulation produces visibly darker, richer lines that contrast sharply on notebook pages, preventing feathering and bleed-through. Its fast-drying formula resists smearing and smudging almost instantly, making it an exceptional choice for both left-handed and right-handed writers navigating fast note-taking or planner schedules. The sleek, minimalist barrel features a seamless rubber grip for comfort during long study or journal sessions. An integrated sprung wire "open wire" binder clip opens wide to securely clamp onto thick notebook covers, pockets, and planners without bending or snapping.