The HHA TWI01 (Tactical Writing Instrument) features a dome shaped crown constructed from high-grade stainless steel that can be used as a glass break in an emergency situation. At the opposing end we have incorporated a pointed tip for sensitive investigative work and for use as a PDA stylus. The entire shaft of the pen is constructed from 6000 series, non-reflective black anodized aluminum for extreme longevity and wearability. The TWI01 includes a series of O-rings making it completely waterproof when the cap is screwed down over the writing tip. Knurling along the pen aids a positive grip. When it comes time to replacing the refill the TWI01 will accept standard Parker and Fisher Space Pen refills. Specifications: Material: 6000 Series Aluminum Finish: Anodized Black Length: 146mm Circumference: 12.5mm “Dull Knife Terminator” – Your Exclusive USA Distributor for HHA! Free shipping to US customers!