We make our money clip wallets with magnets that securely hold a half inch thick wad of cash... These magnets are serious about keeping your cash secure without effecting the magnetic strip on your cards. These babies are the money clips of the future- no more re-bending of your metal money clip which will eventually be the cause of its death. Magnets don't ever lose their special power, and we've constructed the wallets in our typical "made to last" fashion, so this money clip card wallet will be around for a while... unless of course you lose it.