uni-ball Vision Elite Designer Series Rollerball Pens, Bold Point (0.8mm), Black, 4 Count Airplane Safeink wont explode or leak due to a change in cabin pressure during flights Sophisticated barrel designs add a dash of class to your writing Exclusive uni-flow ink system provides consistent smoothness and color intensity Features uni Super Ink which protects against water, fading and fraud Includes: 4 black rollerball pens, 0.8mm bold point, refillable