Check the listing for details. 30 pcs RFID Blocking Sleeves, Secure Credit Card Protection Shield w/Tracking. Color: Gray, Condition: New. Listed at 17.49 USD. 30 pcs RFID Blocking Sleeves, Card Protector, Credit Card Secure Protection Shield =>YOUR PURCHASE WILL BE SENT FREE US SHIPPING SAME OR NEXT BUSINESS DAY WITH USPS TRACKING! ---FIPS 201 Approved by the US Government as Electromagnetically Opaque Shield ---Weather- and water-resistant ---Puncture- and tear-resistant ---Shields ISO 14443/15693 and EPC Gen 1/Gen 2 contactless smart cards and RFID tags Important Details about RFID: Radio frequency identification (RFID) is a technology that uses communication via electromagnetic waves to exchange data between a terminal and an electronic tag attached to an object for the purpose of identification and tracking With credit cards and debit cards, RFID chips hold all of your most sensitive information such as card numbers, expiration dates, names, addresses, birthdays, and more.