RFID Blocking: Credit card holdersuse RFID blocking technology to completely prevent electronic thieves from illegally scanning personal information on credit cards, debit cards and ID cards.An RFID-protected card holder isa wallet or case designed to prevent unauthorized scanning of your credit cards, debit cards, and ID cards. It is constructed with a special, invisible lining, often made of metal composites or carbon fiber, that blocks the radio waves used for wireless data transmission. This shields your sensitive personal and financial information from electronic pickpockets, also known as "skimmers"