Credit Guard RFID Scanner Blocking Cards, Set of 4 The Credit Guard is the size of a credit card that's wafer-thin These RFID blocking cards protect your credit debit and credit cards from illegal RFID scanners The special embedded layer in each Credit Guard will prevent an rfid scanner from reading your card It's so easy and simple to use, you just slide two Credit Guards into your wallet Includes a total of 4 Credit Guard RFID scanner blocking cards