Tired of pens that leak? This one won't—even on an airplane. The uni-ball Vision Elite Rollerball Pen is not affected by changes in a plane's cabin pressure, making it the ideal choice for people who frequently fly for business. And like all uni-ball pens, this roller pen features uni Super Ink which protects against water, fading and fraud. This pigment based ink contains particles that form an indelible bond in paper- it can't be broken...ever. Its archival quality ink is great for documenting and record keeping and is acid free. The larger particles deliver solid vivid colors every time you write. uni-ball Vision Elite Pens- a pen you can rely on.