Silicone wallet with 3M adhesive sticks to the back of most smart phones. Securely holds up to 3 credit cards, a drivers license or business cards. This item is great to protect against identity theft and is also good for hotel keys. Perfect for work, a night on the town, or sporting events, when all you need is a Driver's License, credit card or cash, not your entire wallet or purse. Complies with ASTM, FDA, Prop 65, RoHS. 2.375" W x 3.5" H