This 6" tactical pen is great to have on you at all times and should be an essential part of your every day carry. The body of the pen is made from aircraft grade aluminum and has a sharpened Tungsten tip on one end to easily shatter glass (please wear gloves if breaking windows). The shape and construction of the pen make it a highly effective self-defense weapon as well as a functional pen. Very little force is needed to shatter a car window when struck in the corner with the Tungsten tip. Note that if the car window has tint or a film applied you may still need to rack the window to clear all of the glass. This pen is currently being used by six law enforcement agencies in Washington State and has already been used to extricate a driver from a vehicle collision.