ESOW Self Defense Tactical Pen with Aircraft Aluminum Emergency Glass Breaker Anti-Slip Egonomics Multifunction Tool- 100% The tactical self-defense pen is made of aviation aluminum,durable and practical. can take it to a plane or train. 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;Weighs 1.5 ounces for lightweight carry. Provide nice writing tools with high performance and bodyguard for emergency. Also could be used to break glasses in emergency.