Even the most dependable pen deserves a second act. These Mitsubishi Uni-ball One Gel Pen Refills are designed specifically for the Uni-ball One Tri-Colour Pen, ensuring your favourite writing companion continues its duties without interruption—or decline in quality.

Each refill carries the same quietly impressive ink formula: richly pigmented, satisfyingly crisp, and pleasingly quick to dry. The result is writing that remains clear and composed, whether you’re jotting notes in haste or taking your time with something more considered. Available in both 0.38mm and 0.5mm tip sizes, you can choose between finer precision or a slightly bolder line—depending, of course, on your temperament.

Refilling is straightforward, and rather gratifying. A small ritual, perhaps—but one that keeps your pen, and your thoughts, flowing.

Built for Daily Use

• Consistently crisp ink: Uni-ball One ink delivers bold, clean lines that dry quickly—so you never smudge your work.
• Tailored to your writing style: Choose 0.38mm for finer detail or 0.5mm for a smoother, slightly fuller line.
• Designed to keep your pen going: You always refill your Uni-ball One 3 pen—no need to replace what already works beautifully.

Details

• Ink colours available: Black, Red, Blue
  
• Tip Size: 0.38mm, 0.5mm
  
• Material: Gel ink
  
• Country of Origin: Japan