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AWe recommend 4 credit cards and you can even put and extra card behind or in front ( though better behind because you can then see what your protecting) the top scanner guard card and the bottom scanner guard card. And it gets better when you close the wallet it will protect 4 cards on the other side so in effect that protects at least 10 credit cards when the wallet is clossed.
How many needed to protect 1card? Dec 10, 2014
You need 2 cards to protect 1 card, 1 in front of the card and 1 in back. If you have 5 credit cards in your wallet, the same applies. Also, they can be cascaded at an angle which is very popular in a lot of wallets, again 2 cards needed.
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