Giant Polydron Set - 40 PiecesThis wonderful manipulative come in large sizes for young children. It is a perfect introduction to 2D and 3D shapes; ideal for use indoors or out; heavily textured on one side for sensory integration; includes Braille for awareness of other methods of communication. Great for early years and special needs environments! Includes 20 squares, 20 equilateral triangles, and a product guide.