RFID Blocking Pebble Leather Checkbook Cover with 6 Credit Card Slots Tan. Access Deniedâs RFID Blocking Leather Checkbook Cover is designed to securely hold your checkbook and doubles as a credit card holder with 6 RFID blocking credit card pockets and a hidden pocket for cash, receipts, or additional cards. The checkbook over features a beautiful pebble grain leather that is durable, lightweight and very attractive.