Nowadays, More and more credit and bank cards and have RFID chips. 
To protect your valuable information from being stolen, it is a good choice to have Anti RFID credit/bank card sleeve protectors.  Perfect to avoid unauthorized scans and blocking the ability to scan account numbers, PIN numbers, license numbers, names, addresses, dates of birth, and much more sensitive information.

• Protect your information: The sleeves are made with advanced materials made to block and protect against RFID Technology.  The material serves as a powerful electromagnetically opaque shield, which blocks RFID signals from unauthorized scans. The sleeves protect credit cards, debit cards, ATM cards, driver's licenses, transit cards by shielding and blocking UHF 860~960MHz & HF 13.56MHz frequencies.
• Simple slim design: No cutting or modification required. It is slim enough to fit basic card slots in wallets, handbags, travel bags and smartphone cases.
• Water, tear resistant: Enduring resistant material to stand tears and punctures, suitable for daily use. They're even waterproof, so you don't have to worry about them.