ETA hand2mind Plastic Fillable 3D Shapes, Yellow Geometric Solids for Measuring Volume (Set of 14) Visually demonstrate that different geometric solids can have equal volumes Unique collection features clear plastic solids that can be filled with liquids, sand, or rice Incorporate measurement, mass, and spatial awareness into any teaching lesson Color-coded base illustrates the connection between two and three dimensions Includes 14 unique shapes, including spheres, cones, cubes, rectangles, cylinders, and pyramids with stoppers