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I have been reading about RFID technology and products. Are metal business and/or credit card holders viable substitutes for RFID wallets? Are all metal wallets Faraday cages?

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    What is an RFID wallet? Maybe you meant RFID-blocking wallets? – S.L. Barth Nov 30 '15 at 7:18
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The simple answer: yes.

A metal case, whether it is solid or a fine enough mesh will block RFID.

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