The Defender X Tactical Pen is a pen and flashlight rolled into one. It can write underwater and blind attackers with a bright light source. It’s also made from aluminum Defender X Tactical Pen and is designed to be ultra-durable. It doesn’t contain any blades or weapons, which means you can safely take it on an airplane or in other secure locations. However, there is an aluminum tip on one end of the pen that the manufacturer claims can be used for breaking windows.