It's not threatening. Looking anyway. On the outside, The Tao 2™ tactical pen appears to be a highly stylized writing instrument. But once the cap is off, it's a defensive fighting machine just like the former Recon Marine who created it.  Award-winning knife designer Allen Elishweitz from Lenoir City, Tennessee has practiced martial arts over the past 30 years. So he knows how to make even simple things like pens be a potentially lethal aid in self-defense.  Yet this is no simple pen. Crafted from 6061 aircraft grade aluminum the Tao 2™ is a precision-machined writing instrument. It will continue writing in freezing cold, boiling heat, under water and upside down—or help stop a would-be attacker in their tracks. There's no longer a need to unscrew the cap. An O-ring enables you to quickly take off the cap, post it on the end of the pen and be ready.  The word Tao means the way. And with it in hand it will show you the path to protection. Dimensions Open Overall Length    5.321 inches Weight    1.4 ounces Options Includes 1    Fisher Space Pen® #PR4 Cartridge