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 BIG sets are compatible with each other. Tube features 15 pieces in assorted primary colors, each piece measures approximately 2" by 1-1/8". BPA-free and phthalate-free. Comes with an idea guide. Designed for ages 1-6.