RFID blocking sleeves provide essential protection against electronic theft and unauthorized scanning of credit cards and identification documents while traveling. These specially designed sleeves use metallic materials to create a protective barrier, 10PCS Social Security Card Protector Waterproof Clear Medicare Card Protector Sleeve Social Security Card Protector Sleeves Card Holder Protector Card Bank ID Card Holders 10pcs Clear PVC Bank Card Sleeves Transparent Credit Card Protectors For ID & Cards Waterproof Transparent Plastic Card Clip Protective Sleeve for Credit Bank ID Cards, 1 5 from Dhgate Card Holders price 5.63 Custom Hotel Key Card Sleeves Economy, Standard, & Luxury