[AshamedCaptain]

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.

[numpad0]

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%...