Uni-ball ONE Gel Pen Refill (0.38mm/0.5mm) UMR-38S/UMR-05S

Enjoy deep black ink and vivid colors with this Uni-ball ONE gel pen refill—made for smooth, quick-drying writing with a clean, smudge-resistant finish.Why you’ll love it - Deeper black and more vivid colors: BEADS-PACK pigments trap and confine colorant particles, then increase their size to minimize paper absorption for richer ink appearance.- Non-bleeding and quick-drying: Adjusted ink ratio helps liquid absorb quickly into paper while keeping colorants on the surface for a smudge-resistant experience.The Blackest Ink Ever — Now in Your Hands! Say hello to the uni-ball one, the revolutionary gel pen that took the world by storm and even earned a Guinness World Record for its super-black pigment ink! Designed with cutting-edge Japanese ink technology, the uni-ball one delivers bolder, darker, and more vibrant lines that won’t fade easily. Whether you’re journaling, sketching, signing documents, or just taking notes — this pen makes every word pop.Vivid, deep black inkSmooth, skip-free writingSleek modern designGuinness World Record Holder for darkest gel inkGrab yours now and experience the difference that only the uni-ball one can deliver. Because when it comes to ink — black should mean bold.Compatible pens - Uni-ball ONE- Uni-ball ONE F- Uni-ball ONE PSpecifications - Ink Type: Gel ink- Ink Color: Black / Blue / Red- Refill Dimensions: Φ 6 × 112mm- Weight: 2.5g- Origin: Japan