This pack of colourful plastic magnetic pieces offer a fun way to investigate construction of shapes. Children can work out 2D nets for various shapes by easily attaching the magnetic pieces together then transform them into 3D shapes with their own hands. The shapes are made of a strong durable plastic with rotating magnets so the pieces always connect. This set contains 12 triangles and 18 squares (approx. 65mm). Additional shape packs available triangle, square, diamond, trapezoid, pentagon, hexagon and isosceles triangle.