Boker Plus Tactical Pen Carbon 09BO078 The Caliber .50 Tactical Pen is primarily characterized by its compact construction, yet makes no compromise in terms of writing comfort. The aluminum version with its proven bayonet mechanism has now been complemented by a version with a carbon-fiber body and titanium-coated aluminum endcaps. Overall length 10.9 cm. Weight 27 g Manufacturer: Boker Mfg Number: 09BO078