The Nitecore NTP31 Tactical Pen is equipped with a unique bi-directional bolt design which offers a multi-purposed writing pen as well as giving the functions of self-defense in life-threatening situations. UNIQUE TACTICAL PEN DESIGN: The Nitecore NTP31 pen sports a three-position bolt action design that allows you to pop out either the tungsten tip for breaking glass or the pen tip for writing. Otherwise retract for everyday use and carry. HIGH QUALITY WRITING: A premium German-made gel ink refill and stainless-steel tip offer smooth writing that is quick-drying, waterproof, and fade resistant in harsh weather conditions. WINDOW BREAKER FOR EMERGENCY: The tungsten steel tapered tip can function as an effective glass breaker to smash windows in an emergency. Its hardness is only second to that of diamonds. CONSTRUCTION: Constructed from aluminum alloy that offers lightweight ruggedness with an excellent resistance to impact and corrosion. DIMENSIONS: Weighing only 20 grams, measuring 13.9cm in length. CONTENTS: Nitecore NTP31 Pen, Refill, Manual.