Slip your credit or debit cards into these RFID sleeves and protect your personal information from theft. RFID (Radio Frequency Identification) chips are embedded in credit and debit cards with encoded personal and account information, and criminals now use special scanners to steal it. But these smart little credit card sleeves are specially treated with a metal alloy that blocks RFID data scanners, keeping sensitive info safe. Thin, tear-resistant plastic RFID blocking sleeves fit easily in wallet, card holder or money clip; value-priced set of 4 includes gold, silver, burgundy and brown. Each, 3 1/2" W x 2 1/4" H.