Uni-Ball Signo UM-153 Pen Refills - 1.0mm Nib - Gel Ink - Blue - Pack of 6
Signo Refills. The Signo rollerball features smooth, quick drying, waterproof and fade proof ink. Signo refills ensure continuous writing, right down the the very last drop of ink. Each refill features a 1.0mm nib that writes a bold 0.7mm line.