Uni-ball One UMR-05S Gel Pen Refill - 0.5 mm - Blue Black

Refresh your favorite pen with the Uni-ball One UMR-05S Refill – 0.5 mm – Blue Black, designed for Uni-ball One, One F, and One P gel pens. This refill features Uni’s advanced pigment-based gel ink, delivering deep, saturated color that’s resistant to water, fading, and smudging—even on recycled paper.

The 0.5 mm needle-point tip ensures clean, consistent lines—perfect for daily writing, journaling, note-taking, or sketching. The blue-black ink adds a professional touch, offering a subtle alternative to plain black while still maintaining legibility and style.

Key Features:

• Compatible with Uni-ball One, One F, and One P gel pens

• 0.5 mm tip – precise and smooth for all writing needs

• Blue black pigment ink – bold, fade-resistant, and waterproof

• Writes clearly on both standard and recycled paper

• Easy to replace for sustainable pen use

• Made in Japan – quality engineering and ink technology

Stay sharp and stylish—upgrade your Uni-ball One pen with this reliable and richly pigmented blue black refill.