This is a 6-layer stack case for Raspberry Pi family. It is compatible with all current Raspberry Pi's including 3 B, 2 B, B+, A+, B and A. You can build more layers on this 6-layer case by purchasing our Stackable Kits. (http://www.amazon.com/gp/product/B00MRLM9QS/). You need to peel off the protective paper off before using.