Pilot's Greenball liquid ink pen produces a flawless ink flow, ideal for thick, bold strokes with a grip that is designed for optimum comfort. The pen's medium tip ensures precision and accuracy and the tamper-proof ink is perfect for use on official documents and reports. The shape-retaining, durable, tungsten carbide ball has grooves for additional support and the airplane-safe technology will protect the pen for leakage caused by changes in air pressure. Made from 92% recycled material, this pack contains 10 pens and 10 refills.