Mitsubishi Uni-ball One Tri-Colour Gel Ink Pen

A pen that manages to juggle three colours without ever appearing flustered—quite the social grace. The Mitsubishi Uni-ball One Tri-Colour Gel Ink Pen brings together black, red, and blue in a single, thoughtfully designed barrel, making it a quietly indispensable companion for notes, edits, and the occasional emphatic underline.

Its party trick lies in the rotating selector: a simple twist aligns the colour ring and extends your chosen ink with a pleasingly smooth motion. No frantic clicking, no guesswork—just a gentle, intuitive turn. The slightly thicker barrel sits comfortably in your hand, while a low centre of gravity and internal stabiliser keep your writing steady and composed, even during longer sessions.

And then there’s the ink. Uni-ball One’s gel formula delivers crisp, richly pigmented lines that dry quickly and resist smudging—so your thoughts remain as clear on paper as they are in your mind.

What Makes It Work So Well