Stay well-prepared with the Blood Type Metal Key Fob. On the battlefield this keychain might save your life. The Velcro strap helps combat medics identify your blood type and give you medical care instantly. The quick-release snap hook easily attaches to D-rings on your gear. For added functionality, wrap the hook-and-loop Velcro strap around the MOLLE webbing on your pack or vest to have an easy access to your essentials. This pack includes 4 pieces of the same color and blood type.