Uni-ball One 3 – 0.5mm

The first three-color gel pen from the Uni-ball One series, this twist-action pen combines black, red, and blue inks in one compact, easy-to-use pen. To change between colors, simply align the open wire clip with the color indicator on the ring. To replace the refills, hold the center band of the pen while rotating the pen body. Then, pull out the empty refill you want to replace with the new refill.

It features the same rich gel ink the series is known for, with deeper blacks and more vibrant colors for everyday writing. Its short, thick barrel is similar in thickness to the Uni-ball One P but shorter than the Uni-ball One F, giving it a cute yet balanced look while remaining comfortable in hand, complemented by the clean design and signature open wire clip.

• 0.5mm
• Ink colors: Black, Red, and Blue
• Release date: March 2026
• Also available in 0.38mmand Gift Version
• Refills available
• More Uni-ball One