Rollerball Pen, Black, Pack of 12

Designed to compensate for rapid air pressure changes, the aircraft safe VISION uni-ball eliminates ink leaks in flight, eliminating flight pressure The newly adopted reservoir reduces the space in which air can be expanded, minimising the expansion of air inside the ink reservoir By bypassing a collector, relaxed air is expelled before forcing the ink to come out This results in less powerful ink flow and prevents ink leakage The "Uni-Flow System" guarantees smooth writing performance up to the last drop of ink