Outdoor Tactical Pen aviation Aluminum Anti-skid (Grey) MADE OF AVIATION ALUMINUM THROUGH TYPE III HARD ANODIC OXIDATION,which can be your perfect self-defense tool for emergency. PROVIDE NICE WRITING TOOLS with high performance and bodyguard for emergency. EXCELLENT ANTI-SKID ABILITY:Diamond thread design at the handle. CAN BE USED AS BROKEN GLASS APPARATUS for quickly escaping when driving in an emergency. STRONG ATTACK DEFENSE HEAD,control criminals effectively.