BCP 10PCS Debit/Credit ID Card RFID Blocking Protector Sleeves Package included: 10PCS Size L x W): 3 5/8 x 2 1/2inches The aluminum shielding protects your Debit/Credit ID Card information from reader or scanner, against the risks of Identity theft. Stop blocking from high-tech hijacking scanning equipment waves Ideal for every Credit Card, Debit Card etc.