Airplane Safe- ink will not explode or leak due to a change in cabin pressure during flights. Exclusive uni-flow ink system regulates a steady flow of waterproof ink to the point for consistent smoothness and color intensity down to the last drop of ink. 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 for documenting and record-keeping. Quick-drying, water-resistant ink. Stainless Steel tip. Refillable. Medium Point- 0.5mm. 1 Black Ink Pen