Refill for uni-ball one pens, designed for deep, vivid color and a smoother writing experience.
Darker Black, More Vivid Colors: Special pigment ink produces sharper, more memorable writing. Proven to enhance memory retention in studies with Ritsumeikan University.
Smudge-Free & Fast-Drying: Unique ink formula dries quickly without bleeding or feathering, even on regular paper.
Minimalist Design: Refill body features a clean, straight design with color-coded barrels—black ink uses a sleek black body, while color inks use a calm off-white tone.
Perfect for notes, study, or professional writing—refill your uni-ball one with confidence.
This refill can be used with all uni-ball one pens.
