Qingsun Aircraft Aluminum Defender Tactical Pen with Glassbreaker- Gun Metal The tactical self-defense pen is made of aviation aluminum. Manganese steel pen holder: Accord with ergonomics design, easy to hook on your backpack, bags, notebook. Diamond thread design at the handle, excellent anti-skid ability. Provide nice writing tools with high performance and bodyguard for emergency. Also could be used to break glasses in emergency.