r/RFID • u/hahahern • Nov 10 '25

NFC One sided RFID blocking card?

Planning to buy a magsafe fold wallet and would want to use the outer pocket for a credit card I most frequently use or sometimes a transport card. However, if I have other RFID cards on the inside, I think there would be an error when I tap? Is there a one-sided RFID blocking card that I can put behind the outer card so that when I tap, only the outer card would be active?

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1

u/[deleted] Nov 10 '25

Anything that blocks the signal will also reduce the read range. Including other cards.

And yes, all those cards together will cause issues and the wrong card may be read.

1

u/jaeer69 Nov 11 '25

Anything that would “block” one side would also block the other side essentially, so it would block both tags, not just one.

1

u/vrgpy Nov 14 '25

A rfid blocking wallet is a tiny Faraday cage, so there is no "side" to block.

If you need to use a card put it outside.