Enjoy a steady flow of ink every time! Exclusive uni-flow ink system(TM) regulates a steady flow of ink as you write. Waterproof ink flows consistently to the point for smoothness and color intensity down to the last drop. Archival quality and acid free for documenting and record keeping. Ink is designed to become trapped in paper, helping prevent criminal check washing and other document alterations. Features uni Super Ink specially formulated to help prevent check fraud. Convenient pocket clip for portability. Uni-ball Pens part of a large selection of office supplies. uni-ball(R) Vision(TM) Rollerball Pens, 0.5mm, Micro Point, Black Barrel, Black Ink, Pack Of 12 is one of many Rollerball Liquid Ink Pens available through Office Depot. Made by Uni-ball.