The Superball is back! The amazing bouncing Super Ball was a toy phenomenon when Wham-O introduced the mysterious black ball in 1966. The extremely elastic ball made of Zectron has an amazing coefficient of restitution with over 50,000 pounds of compressed energy. Great fun for outdoor play or indoor science experiments! For over 40 years this toy has amazed 3 generations of toy lovers. A classic retro toy that makes everyone smile!