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&apos s two-dimensional properties. Set of 16 pieces (8 geo shapes 8 plastic casings) includes red, yellow, green and blue cylinder, square pyramid, cube, rectangular prism, cone, hexagonal prism, triangular pyramid and triangular prism, and clear plastic casings.