uni-ball Roller Ball Pen eye fine (UB-157), Color: black Line width: 0.5 mm, indelible ink, waterproof Pen body color: gray silver (148199/UB157N) • Line width: 0.5 mm • ball diameter: 0.7 mm • indelible ink • pen body color: silver / gray • usable with duplicating paper • view ink level • with metal clip • water-based ink • waterproof