Learning Resources Relational GeoSolids teaches shape, size and volume relationships with plastic, translucent geometric shapes. These 3D maths resources are hollow and feature removable stoppers that enable the user to fill them with rice or sand. Set includes 14 size-related shapes made up of spheres, cones, cubes, rectangles, cylinders, pyramids and polyhedrons. Includes Teaching Guide. Shapes measure 5cm.