Newcomdigi Aviation Aluminum Self Defense Tactical Pen, Portable Generation Tactical Pen with Glassbreaker Gun Metal,Self Defense Camping Tool The Newcomdigi tactical self-defense pen is made of lightweight aircraft aluminum. Provide nice writing tools with high performance and bodyguard for emergency. Also could be used to break glasses in emergency. Diamond thread design at the handle, excellent anti-skid ability. 5.9 inches overall, black and silver color.