Explore geometry, volume, and other measurement concepts with these transparent 3-D shapes fashioned in bright, bold colors. Removable bases allow for relating 2-D shapes to 3-D solids. Easy to fill with liquid and easy to clean. Set of 14. Transparent, 3D plastic shapes get an update bold, bright colors! This selection of common geometric shapes offers a concrete way to explore geometry, volume and other measurement concepts. Allows students to relate 2D shapes to 3D solids by examining and comparing the removable bases. Fills with liquid or dry fill for studies of volume, and cleans easily.