Description Ballpoint pen with cap and clip Airplane-safe: An automatic pressure equalization prevents the pen from leaking on board aircraft Ergonomic triangular barrel for effortless and fatigue-free writing Transparent barrel Particularly smooth writing performance Indelible ink conforming to ISO 12757-2 (except red) Cap, tip and end plug in writing color Available in four classic writing colors (red, blue, green and black) and two line widths (F and M)