Polydron Multi-Colored Plastic Geometric Platonic Solids and Shapes (Set of 50) 50-piece set of interlocking shapes includes 32 equilateral triangles, 12 pentagons, and 6 squares in 4 colors (red, green, yellow, blue) Set enables the learner to easily construct all three shapes to understand and feel the forms Use to teach 2- and 3-dimensional geometric principles Feature a unique clip hinge that makes it easy to build shapes and structures while teaching geometry Ages 4 and up