Sminiker Professional Defender Tactical Pen Aircraft Aluminum Self Defense Pen With Glass Breaker Writing Multifunctional Survival Tool (Black) N/A Made of Aircraft Aluminum ,Heavy-duty Tactical Pen,effect tactical action, improve safety coefficient. Lightweight and Portable,Features an Ultra durable carbide tip Glass Breaker, could be used to break glass in emergency. Provide Nice Writing tools with high performance, accord with ergonomics design, easy to hook on your backpack, bags, T-shirt,notebook. Crown Head design ,Thread Design at the handle, excellent anti-skid ability. Compatible with Standard Refills.