ELENKER Survival Tactical Pen Multifuncational Pen Emergency Hammer with Whistle Multipurpose Tactical Pen for wide application - Features glass breaker, writing pen, whistle. Made of aircraft-grade aluminum, length: 4.2 inches, weight: 1.6 oz. This is an excellent writing utensil. Come with 2 extra black fine point refills. Pocket clip for faster response. youll enjoy wearing your self defense protection to be prepared. Never get trapped in danger, the wolves are prowling and you will not always be a sheep. Heavy-duty Tactical Pen, made of Aircraft Aluminum, effect tactical action, improvesafety coefficient. Lightweight and portable. Provide nice writing tools with high performance, accord with ergonomics design, easy tohook on your backpack, bags, notebook. Features an ultra durable tip Glass Breaker, could be used to break glass in emergency. Designed with users comfort and excellent anti-skid ability. Compatible with Refills.