The Magnetic Polydron Sphera Class Set contains enough pieces for a classroom of children to learn how to form shapes such as spheres, cylinders and cones with these magnetic pieces. 2D and 3D shapes are easy to form using the magnetic connections, and the inside pieces are coloured black to help teach polarity. This 72 piece set contains 8 Anti-Quadrants, 4 Squares, 16 Spheres, 24 Quadrants, 8 Cones, 8 Cylinders, 4 Right Angle Triangles and a Guide.