The Boker Plus 09BO078 Carbon Tactical Pen is primarily characterized by its compact construction, yet makes no compromise in terms of writing comfort. This design is from Thomas Braunagel"s think tank: the smaller version of the popular CID CAL .45. Shorter, thicker in circumference, and with a traditional clip, the K.I.D. CAL .50 is very comfortable to grip and sits easily in the hand while writing. The special design makes this machined aluminum writing tool a real eye catcher, and its ingenious mechanism appeals to the urge to "play." This model is made with a carbon fiber body and titanium coated aluminum end caps. Not a firearm. Compatible with Fisher Space Pen cartridge #PR4, which can be purchased at www.spacepen.com. Overall length: 4 ⅜ in. Weight: 1 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.