US Mint Quarter - Micro SD Card Covert Coin - Secret Compartment US Quarter Covert Coins are expertly precision hand-machined from actual coins to create a secret interior compartment Once closed, they are absolutely indistinguishable from regular coins to the naked eye They can be handled normally without any chance of an accidental opening An opening device is supplied with each covert coin, without which it's next to impossible to open up the coin. Quarter ONLY - Will NOT Fit Micro SD card