🚫 No Blood Wristbands Acts Like A Medical Alert Bracelet To Ensure That Medical Personnel Are Alert As Soon As Possible Of Your Refusal Of Blood Transfusions. In Order To Serve Their Purpose, No Blood Wristbands Should Be Worn 24/7 In Case Of Emergency, (Durability) No Blood Wristbands Are Comfortable To Wear As Well As Heat And Water Resistant. The Wristbands Are Made From 100% Medical Grade Silicon (BPA Free, Latex Free, Non-Toxic And Non-Allergenic).