They block the signal, if you keep it in your wallet like me, expect some wear and tear after a few months of use (obviously). Keep in mind that this will block the map signal. So if you break into your home with RFID and your card is sandwiched between two RFID blocking sleeves, your card won't work. While this proves that the product is effective, it may bother you in terms of practicality, so be careful how you put your cards in your wallet.
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