Never run out of your favorite ink. These premium gel refills are designed specifically for the Uni-ball One Multi pen system. Whether you prefer the surgical precision of the 0.38mm or the smooth, bold flow of the 0.5mm, these refills are completely interchangeable within your multi-pen barrel.

Superior Contrast: Featuring Uni-balls “Beads Pack” pigment technology, the ink sits on top of the paper fibers. This creates a darker black and more vivid colors that are clinically proven to be easier to remember.

Smear-Proof & Fast-Drying: The specialized formula dries almost instantly, making it the gold standard for left-handed writers and fast note-takers.

Customizable Precision: Both tip sizes fit the same housing. Feel free to swap a 0.5mm for a 0.38mm if you need to switch from bold headings to fine-print detailing.

Compatibility & Specs
Fits: Uni-ball One 3 (Multi-Pen), Uni-ball One P, Uni-ball One F, and Standard Uni-ball One bodies.

Tip Sizes Available: 0.38mm (Ultra-Fine) / 0.5mm (Fine)

Ink Type: Water-resistant, Fade-resistant Gel Pigment