Maximum detectability - Metal and x-ray detectable pens molded from FDA food contact approved materials in the universally accepted color for visual detection - blue. Positive retracting mechanism - Cartridge will not jump out of position however much pressure is exerted on writing point. Highly visible ink indicators - Dominant top button and large window identify ink cartridge color. Strong pocket clip "“ Designed as virtually unbreakable. No need to specify model without clip. Large lanyard loop - Intended for a real lanyard, not just a thread. Unique cartridge suspension - Provides that firm writing experience without the need for a metal spring. Smooth finish - Easy to clean. Contoured for thumb and finger - with textured surface for enhanced grip and writing comfort. Safe under duress - Molded from shatter resistant polymers to avoid splintering if crushed. Long writing life - superior quality European ink cartridge with Tungsten Carbide ball for smooth, consistent ink flow. A minimum of 9km of writing length. Two ink colors - blue and black.