Outsmart tech-savvy data thieves! RFID sleeves feature metal alloy to block radio-frequency identification scanners, so your personal information stays safe and protected. Simply slide credit cards into these ultra-thin, tear-resistant RFID blocking sleeves and store in your wallet, card holder or money clip. Value set of 4 credit card sleeves includes gold, silver, burgundy and brown. Each polyurethane sleeve measures 3 1/2” W x 2 1/4” H.