Protective aluminum cases from reading cards. The most useful thing in 7 copies for 2.19 E. I have a wallet-bracelet, for transport card, bank, medical card and ID. And they're all with chips. Because of this, the transport card is poorly read when passing the control, and it should be constantly removed from the wallet. These cases solve two tasks at once-blocking the rest of the cards for safety purposes and normal reading of the ticket. It is also a useful gift for a very symbolic price.