uni-ball Vision Elite Rollerball Pen Refills, Bold Point (0.8mm), Black, 2 Count Airplane Safeink wont explode or leak due to a change in cabin pressure during flights Refills fit uni-ball Vision Elite rollerball pens Exclusive uni-flow ink system provides consistent smoothness and color intensity Features uni Super Ink which protects against water, fading and fraud Includes: 2 black rollerball pen refills, 0.8mm bold point