Our RFID blocking materials block 10MHZ to 3000MHZ frequency. That's plenty protection for blocking a bank card like a debit card or credit card which is a 13.56MHZ frequency.
Our RFID protected wallets do not block Access Cards. Access Cards typically have a frequency of 125KHZ.
1MHZ = 1024KHZ
Metro Cards and Bus Cards have a frequency of 13.56MHZ.