Make your own 2D figures and skeletal 3D models. Learn about vertices, faces and edges while involved in constructing new models. 330 pieces includes 60 white balls, sticks of 50 each of 1.29", 2.08", 2.72", 30 each of 3.32", 4.13", 4.92" and 30 quarter circles with 20 double-sided activity cards.