The GG&G Penatrator is a defense tool designed to provide a covert tire deflator, or radiator leak initiator as well as a defensive weapon that can be used in unforeseen emergency situations. In the passive mode, the Penatrator looks like nothing more than a pen but by removing the pen cap a very sharp point is exposed that will aid in dealing with an unexpected threat. There are two models are available; a 2.6"; hollow carbon fiber shaft and one with a 2.6"; hollow titanium shaft. Both models are extremely rugged, corrosive resistant and lightweight. The hollow shafts provides an effective route to let what's inside--outside! The handle on both models is manufactured from Delrin and is grooved to provide a positive grip in the most demanding situations. The tip is protected by a standard pen cap which also serves to protect you while carrying the Penatrator in the passive mode.