These Blood Type Helmet Removal Stickers could save your life in the event of an accident on the race track. In the event of a spinal, head, or neck in jury, you want a professional to remove your helmet to prevent further damage. Additionally, responders can quickly identify your Blood Type and notify your emergency contact. Please enter your Blood Type and the number for an emergency contact (optional). The stickers are 3" wide by 1.5" tall.