Shields 13.56 MHz RFID Technology smart cards including MIFARE, iClass, PIV, CAC, TWIC and FRAC Protects smart cards from information and identity theft No need to remove card from the holder. Simply flip it away from the shield to transmit the card's data. Release the card and the magnet will pull it right back to its protected state. Made of durable, lightweight vinyl Dimensions: 2-1/4" x 3-1/2" (IS) 2-3/4" x 5-1/4" (OD) Made in the United States of America