Use these baseplates as ground zero for your Plus-Plus creations. You can even attach baseplates together like bunkbeds using Plus-Plus pieces! Plus-Plus is a unique construction toy. Its one simple shape, which looks like a double plus sign, contains endless possibilities. Assemble pieces flat to create a 2D design, or build 3D structures. Even curves are possible. Precision crafted in Denmark, Plus-Plus sets are compatible with each other. Package includes 2 green Plus-Plus baseplates, each measures 4-1/2" square. Plus-Plus building pieces sold separately. BPA-free and phthalate-free. For ages 5 and up.