Learning Resources Relational Geometric Solids Set of 14 clear plastic geometric shapes Demonstrate the relationship between shape, size and volume Removable stoppers allow students to fill with rice or sand Includes activity guide Ages 8+ 14 clear plastic geometric shapes 3-D polyhedra have common dimension and removable stoppers Includes Teaching Guide. Grades 312 removable stoppers allow students to fill them with rice, sand or DryFill beads