RFID Blocking Credit Card and Passport Sleeves are designed to help protect your vital information from electronic pickpocketing, also known as Radio Frequency Identification (RFID) skimming. With credit cards, passports and other important documents coming with embedded radio frequency chips in them, it is important to protect yourself against identity theft. RFID blocking ID sleeves are made from a polyethylene terephthalate material, which is used to protect against electronic skimming, and are water and tear resistant. The 12 pack includes 2 passport sleeves and 10 credit card sleeves, which fit any standard passport, credit card, and standard wallets.