The Magnetic Polydron Class Set is an ideal set for a classroom of children to explore geometry by creating 2D and 3D shapes with magnetic squares and triangles. This Magnetic Polydron Class Set contains 36 squares and 60 equilateral triangles and comes with a poster to guide and initiate play. With over 300 magnets, it is ideal for classrooms of children to use at the same time. Open frame pieces allow you to see inside. All pieces are magnetic. Square measures 6 x 6cm (2.4 x 2.4 inches).