Transparent geometric shapes in bold, bright colors provide a concrete way to explore geometry, volume and more. Let your students examine the removable bases to teach them about the relation between 2-D shapes and 3-D solids. Or, fill the pieces with liquid or dry contents to study volume. Durable plastic construction cleans easily for long-lasting use. Activity guide includes formulas and intervention strategies to enhance your lessons. Geometric shapes are designed for children ages 8 and above.