This ideal class set allows you to build over 16 different spherical models together. Sphera brings all the benefits of Polydron to help you understand spheres cylinders and cones.This pack comes with thorough and easy to follow instructions. This 196 set contains: 20 Squares 36 Spheres 72 Quadrants 16 Cones 12 Cylinders 40 Right Angle Triangles and an Exploring Booklet.Sides of squares measure 73mm.Age: 8+.