The Boker Plus MPP (multi purpose pen) functions as a high quality writing tool as well as a stylus for a smart phone or tablet. The glass breaker tip is perfect in case of emergency and in a pinch, the pen can be used as a self defense kubotan. The deep finger grooves on the grey aluminum body make for comfortable writing. Screw cap prevents accidental separation. Has a pocket clip. Compatible with Fisher Space Pen cartridge #PR4. SPECIFICATIONS: Overall length: 6" Weight: 1.4 oz.