Ideal for exploring properties of 3-D solids, relationships between 2-D shapes and 3-D solids, volume and capacity, and surface area. Made of durable plastic with rounded corners and edges and 3-1/8" bases. Includes folding 2-D/3-D geometric solids (cube, cylinder, cone, triangular prism, square pyramid, and triangular pyramid), corresponding folding nets made from soft plastic, and an activity guide.