The New Thin Red Line Card Holder is perfect for those who don't want to carry around a wallet. 3M adhesive backingĀ ensures that the card holder firmly stays on your phone without worry of it falling off. CompatibleĀ with All iPhones and Androids, stickyĀ enough to firmlyĀ hold cards or cash on the back of most phone cases as well. With a simple and sleek Thin RedĀ Line American Flag on it, this is an essential item for any Firefighter or Supporter.