He is really concerned about the privacy issues and hence come up with RFID blocking Duct Tape. Dustin Kirk, an engineer from Benefitfocus has developed a wallet that can block RFID signal. The engineer has published his thoughts here. The most amazing claim from him, the wallet can be built at minimum cost by using duct tape and aluminum foil.
In creating a RFID Blocking Duct Tape Wallet, the only step that needs to be modified is the first one. To create a sheet of RFID Blocking tape, simply place a sheet of foil on the table, and place strips of Duct Tape overlapping on top. Once created, the sheet can be cut with scissors to the sizes needed to continue making the wallet.
Source: [vnunet]
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Can you imagine duct tape after it heats up to body temperature in your back pocket? What a mess! Instead, consider WalletGard RFID Blocking Inserts for your wallet. Prevents RFID reading of any/all cards in your wallet and prevents accidental de-magnetizing of mag stripe cards. Check it out at www.WalletGard.com