Vision Elite Roller Ball Stick Water-Proof PenThe patented airplane-safe technology prevents leakage on flights. Features Uni-Super Ink™ that helps prevent against check and document fraud. Fade-proof, acid-free waterproof ink provides permanence for important documents. Transparent barrel window shows when you're running low on ink. Special Ink Type: Water-Proof; Pen Style: Stick; Ink Color(s): Purple.