Relationship Solids (Geometric Solids) - Set of 15 Solids with Lids including Cube, Cone, Triagular Prism, Rectangular Prism, Pentagonal Prism, Hexagonal Prism, Square Pyramid, Cone, Triangular Pyramid, Rectangular Pyramid, Pentagonal Pyramid, Hexagonal Pyramid, Sphere & Hemisphere. Made of durable plastic, with rounded corners and edges. 5.5 cm base.