Uni-ball 207 BLX Series, Gel Pen, 0.7mm, Purple (SAN1837934) Features unit Super Ink specially-formulated to become trapped in paper, helping prevent criminal check washing and other document alteration. Textured grip provides superior writing comfort and control making this pen truly a pleasure to write with. Stylish metallic accents with a high quality finish. Archival quality and acid-free ink for documenting and recordkeeping. Quick-drying, water-resistant ink.