The Nitecore NTP31 Bolt Action Tactical Pen is a uniquely designed aluminum alloy bolt action tactical pen. The 3-position bidirectional bolt action allows you to pop out the pen tip or window breaker, or retract both for everyday carry. The tactical pen houses an easily replaceable Schneider gel ink refill for quick drying, waterproof, and fade-resistant writing. On the other end of the NTP31 pen is a tapered tungsten steel point window breaker, whose hardness is only second to diamonds. Whether you use this as a pen or a multipurpose tool, it's able to pass security screening and can be used for self defense in life-threatening situations. This tactical pen is always ready for a powerful counter-strike.