Uniball - Deluxe Rollerball Pen, Waterproof/Pigmented, 0.5 mm, Black, (1-Pack of 12) Stick roller ball waterproof/pigmented ink pen with pocket clip features a conical tip plus a smooth grip Writes as smooth as a fountain pen without the mess Features Uni-Super Ink specially-formulated to become trapped in paper helping prevent criminal check washing and other document alteration Archival quality and acid-free ink provides neat accurate lines Attractive black matte finish with strong long lasting metal clip