Uni-Ball One UMR-38S Gel Pen Refill - Black - 0.38 mm

Uni-Ball UMR-38S gel pen ink applies the newly developed "Uni-ball One" ink. The pigment in "Uni-ball One" ink minimizes the penetration of the ink into paper fibre. As a result, it develops original colours on paper, showing a darker black than an ordinary black ink pen, and showing more vivid colours than other coloured ink pens.

Use it with the Uni-Ball One P Gel Pens and Uni-Ball One F Gel Pens!