Columbia River Knife and Tool TPENT Elishewitz Tao Pen Tactical Penbr Precision titanium design br Pointed butt of pen may be used to thrust or provide a disabling pressure point br Pen point may be thrust for penetration in soft tissue br Pen made of 6061 aluminum precision machined and hard anodized br Fully functional writing instruments use the Fisher Space Pen ball point cartridge which is pressurized design developed for NASA