PU leatherette;Pocket with removable adhesive back for placement on smartphone, cell phone or mobile device; Non-residue adhesive sticks to the back of your mobile phone; Single pocket doubles as a wallet - insert transit cards, credit cards, IDs, and business cards; Elastic panel at top allows pocket to adjust to fit most card sizes (holds up to 3-4 cards); Product Size: 2.625" w x 4" h x 0.125" d;