UCEC Portable B5 Aviation Aluminum Tactical Pen with Glass Breaker and Self-Defense Mutifunctional Emergent Tool Made of ultra high hardness aviation aluminum ,the surface is III type hard anodic oxidation. Aviation aluminum material made, durable and practical. Can be used as broken glass apparatus for quickly escaping when driving in an emergency. High-grade business office pen ,writing very smooth, fashionable design for elegant gift giving.. Twist to open and close.