Airplane-safe technology resists leaking during flight Visible ink supply through 2 barrel windows. Liquid ink is waterproof and nonfading. Acid free for record-keeping and archival use. Convenient pocket clip. Features uni Super Ink(TM) that helps prevent against check and document fraud. Uni-ball Pens part of a large selection of office supplies. uni-ball(R) Vision(TM) Liquid Ink Rollerball Pens, 0.6mm, Fine Point, Black Barrel, Black Ink, Pack Of 12 is one of many Rollerball Liquid Ink Pens available through Office Depot. Made by Uni-ball.