It holds up to 10 standard Micro SD cards and one standard "Micro SD to SD card adapter" The Micro SD Card Holder/Case features a positive locking feature by way of a moving independent tab for each Micro SD card that is an integral part of the single molded piece. Each sleeve has the forward right retaining tab offset to the left such that the Micro SD cards can only be fully inserted with the electrical contacts facing down and fully protected. Sized and shape of a credit card allowing it to easily be carried. Hole for keychain. SD cards and adapter not included