The Nitecore NTP31 is a multifunctional pen with a bidirectional bolt design. The pen is ideal for tactical use and can serve as an everyday writing instrument as well as a glass breaker in emergencies. The slider in the unique bidirectional locking mechanism can be skillfully maneuvered in the L-shaped groove to select and retract either the pen refill or the tungsten steel tip. The tactical pen uses the Schneider Gelion+ ballpoint refill, which allows for quick-drying, waterproof, and lightfast writing. The stainless steel tip has a long lifespan and ensures a particularly smooth writing experience. The NTP31 is made from aerospace-grade aluminum alloy with a hard-anodized finish, making the pen lightweight while providing corrosion and impact resistance. The pen features a sturdy stainless steel clip for easy attachment to your pocket, shirt, or backpack.