NiteCore NTP10 Titanium Tactical Pen w/ a Titanium Knife Gift Set Durable,compact and lightweight (0.64oz) collectible titanium tactical pen that is a premium pen and a window breaker and self defense tactical tool. ts tungsten steel tactical tip is more resistant to fracturing than diamond and is much harder than steel. Its Fisher space pen pressurized refill ensures smooth pen stroke on any surface under any environment. Well designed and precisely milled, the pen is perfectly fit at every level even after many years' use and multiple refills. Also include a bonus titanium knife with ceramic blade that is lightweight (2oz), extreme hard, and never dull or rust.