At only 5.63" in overall length, this Tactical Pen packs quite a punch. The non-writing end of the pen can be used in an emergency as a glass breaker. It also doubles as a self-defense tool and can be used to strike a would-be attacker. The pocket clip allows for easy carry so that you always have not only a pen with you but also a lifesaving tool. The pen twist open to write and writes in black ink. Aluminum construction makes it lightweight but durable.