This innovative folding geometric shape set is perfect for hands - on lessons in symmetry, perimeter, area, surface area and volume. Each three - inch shape folds flat, allowing for illustration of a three - dimensional shape's two - dimensional properties. Set of 16 pieces includes red, yellow, green and blue cylinder, square pyramid, cube, rectangular prism, cone, hexagonal prism, triangular pyramid and triangular prism, and clear plastic casings.