Integra Oil Based Gel Ink Pen - 1 mm Pen Point Size - Black Ink - 12 / Dozen Revolutionary, oil-based gel ink writes like a gel and lasts like a ballpoint Bright intense ink is quick-drying Ink is also waterproof, permanent, fade-resistant, acid-free and archival safe Won't smudge or smear on most paper Cap, end cap and comfort grip depict ink color