Performer hands their wallet to a spectator then asks them to hand it back. The spectator is then asked to remove the magician's ring and place it into the wallet. The performer asks if they have ever heard of Deja Vu. Performer hands their wallet to a spectator then asks them to hand it back. When the spectator is then asked again to remove the magician's ring and place it into the wallet, they are very surprised to see it back on the magician's finger!

Mercury Wallet will allow you to do more than card in wallet:

A card is slid out from a face down deck and folded. You open your wallet to reveal a prediction in the window part of your wallet. You remove the prediction and unfold the card... They match!
Correctly predict the serial numbers of a borrowed bill.
The proof is in your wallet!

Comes complete with Mercury Wallet made of genuine leather and 11 page photo-illustrated instruction booklet including 3 routines.