Rogue Wallet: WalletGuard ID Theft Protected Credit Card Sleeves (Fern) Made in U.S.A.; FIPS 201 approved 3-PACK (3 credit card sleeve protectors) Dimensions: 3 3/8: x 2 5/16 Designed to shield smart cards, credit cards, and other ID cards that operate at a frequency of 13.56 megahertz. May not shield other RFID enabled cards that operate at a different frequency.