More than just a daily writing utensil, the NITECORE NTP21 is the anticipated update to the NTP20 tactical pen. On one end, the tungsten steel tapered tip functions as an effective glass breaker to smash windows or as a tool for self-defense. For writing, the NTP21 is equipped with a high-quality, German-made gel ink refill that is quick-drying, waterproof, and fade-resistant. The stainless steel tip of the NTP21 offers smooth writing in extreme cold and hot temperatures, underwater, and even when you are traveling in a shaking car or plane with ease.