Material: Silicone, 3MM adhesive Product Features: Leave Bulky Wallet At Home Fill it up with 3 cards, no more need for a bulky wallet or purse. Just slip your credit cards, ID and some cash into the card holder and you're ready to go! Slim and Lightweight it's so thin and compact that won't add bulk or make your phone harder to carry even when in a front pocket, purse or handbags. Preserves your phone's beauty with a slim and soft feeling. 3M Adhensive Tape 3M adhesive securely attaches to the back of any smartphones or phone cases, and won't come off until you remove it. Tight & Protective Secure Firmly hold all the items you can fit in for your convenience and prevents content of the pocket from falling, even when the pocket is upside down! More Multiple Use Than Your Expectation Not only used as phone card holder, these adhesive pockets can also be used as a secret pocket in a personal locker, glove box organizer for parking cards or cash, a remote control holder on back of TV or even as a hidden compartment for your gym bag. Easy to Install and Remove 1. Clean the back of your mobile device. 2. Remove the film of the adhesive. 3. Place the card case on the back of your phone or case. 4. If you don't want use, it could be removed clean from your cell phone back easily Universal Compatibility