5.11 steadfastly support tactical, military, and law enforcement operators who put it all on the line. When the worst happens, 5.11® Has your back. Our Blood Type Patch Kit is designed to provide fast and accurate information to EMS and medical services professionals, announcing your blood type and medical allergies clearly and legibly, and ensuring that you receive the attention you need without delay. Supported by a broad range of 5.11 apparel, bags, and accessories, the 5.11 Blood Type ID Kit provides peace of mind in a turbulent world. Material: Velcro.