The green microSD 10 Slot Cardholder from Classico Worldwide LLC is a one-piece molded plastic credit card sized storage unit. The holder features ten individual slots constructed in such a way that the memory cards can only be inserted one way-facing down to protect the electrical contacts. Each slot has a locking tab that holds the card in place. There is also a space to hold a microSD to SD Card Adapter. A hole is provided so you can attach the holder to your keychain.