The Thin Blue Line Card Holder is perfect for those who dont want to carry around wallet. 3M adhesive backing ensures that the card holder firmly stays on your phone without worry of it falling off. Compatible with All iPhones and Androids, sticky enough to firmly hold cards or cash on the back of most phone cases as well. With simple and sleek Thin Blue Line American Flag on it, this is an essential item for any Law Enforcement Officer or Supporter. Thin Blue Line AM-CCH. Style American Flag with Blue Stripe. Holds up to cards. Firmly attaches to almost any phone or phone case. Strong, 3M adhesive backing.