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No, they don't. Even TFA itself points that the moment you have two cards in close proximity, the reader will read nothing (and he points this as if it was a feature). This is why I have to stop and take my cards out of the wallet every time I want to go in.


try these[1], they go between cards and prevent the one behind it from being read.

1: https://www.google.com/search?q=%E6%94%B9%E6%9C%AD%E3%82%A8%...




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