Boker USA Mpp Black . It not only serves as a high quality writing tool and a stylus for a smart phone or tablet it also features a glass breaker tip in case of emergency and can be used as a kubotan for self defense. The sturdy clip keeps it readily accessible at all times and the screwed on cap prevents accidental separation. The deep finger grooves provide superior comfort. To change the ink cartridge simply unscrew the pen counter clockwise to prevent. Compatible with Fisher Space Pen cartridge #PR4. Specifications for Boker Plus Tactical Pen: Manufacturer: Boker Plus Color: Black Fabric/Material: Aluminum Overall Length: 5.9 in Condition: New Weight: 1.4 oz Features of Boker USA Plus Mpp Multi Purpose Tactical Pen: Diameter (Cap): 13.9mm Can be used as a kubotan for self defense Deep finger grooves provide superior comfort Overall length: 6" Handle material: Anodized aluminum Weight (oz.): 1.4 Package Contents: Boker Plus Tactical Pen