Reusable card case made of 52% Wheat Straw and 48% Polypropylene Plastic with interior Aluminum RFID Panel; Made using approx. less plastic by blending with wheat straw;Holds approx 2 to 3 cards; RFID protects the integrity of your electronic personal data on credit cards; Product Size: 3.625" w x 2.5" h x 0.25" d;