The Boker Plus 09BO090 Tactical Pen is an innovative new development to join the Boker Plus line. Made from lightweight but sturdy aluminum, this tactical pen features a black anodized body, with a checkered body and cap to provide a secure grip. The Boker Plus Tactical Pen also has a hard, rounded stainless steel insert on the shaft end, which allows it to be used as a Kubotan. The cap has a precision screw and is secured by an internal o-ring. To write, the optional cap can be easily slipped back to the stylus. Compatible with Fisher Space Pen refills. Overall length: 6 in. Diameter: 13 mm. Weight: 2 oz. This Boker Plus pen isn't for cutting, it's for leaving a mark. Limited lifetime warranty. A chestnut tree is the world famous trademark of the Boker knife manufactory in Solingen, Germany. It represents innovative, high quality, exceptional knives, manufactured with pride, by hand, for over 145 years.