Be smart and keep your cards close to you without the bulk of a bag or wallet. Silicon wallet attaches to your cell phone with adhesive glue, holds up to 3 cards securely. Perfect for travel beach days or a night out. *** Samsung S8 / iPhone 8/Plus and newer phones with the back glass surface*** These phones are made of a glass material and the adhesive glue will not work on this material. For this product, a case must be used if the phone has a glass back surface.