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"View-Thru Geometric Solids. Transparent, 3-D plastic shapes get an update-bold, bright colors! Concrete way to explore geometry, volume and other measurement concepts. Removable bases allow for relating 2-D shapes to 3-D solids. Easy to fill with liquid or dry-fill, and easy to clean. Includes large triangular pyramid, square pyramid, hemisphere, sphere, cone, pentagonal prism, small and large cube; rectangular prism, triangular prism and cylinder. Measure 3 or 6 cm. Activity Guide includes formulas and interventions. Grades 3+."