UB-200 Vision Elite Medium Rollerball Pens, Blue Uni Super Ink, Tamper Proof, 0.8mm Ball, Box of 12 Features Airplane Safe technology prevents leaks due to pressure changes in aircraft cabins, perfect for the frequent traveler Filled with Uni-Ball Super Ink, an advanced ink formula that bonds to paper fibers, fade resistant, water resistant, and acid free, resistant to chemicals that wash dye-based ink from checks. Uni-flow system creates a steady flow if ink to give a smooth, consistent color that forms and indelible bond on paper An 0.8mm ball creates a thick, bold line that is ideal for letters and journals, blue Ink in a Box of 12 Sleek, elegant look and feel with a pocket clip and grip area for extra comfort, capped top stays put and ensures that this pen will never leak in your pocket