Simple, elegant, and with a form-follows-function design, the blue Micro SIM & Micro SD Cardholder from www.SDcardholder.com will hold four micro SIM and five micro SD cards. This holder is about the size of a credit card, and is made of ABS plastic. Easy to carry, there's also a convenient hole for attaching to your key chain. For added protection, cards only insert with electrical connections facing down.