It is an extremely elastic ball made of Zectron, which contains the synthetic rubber polymer polybutadiene, vulcanized with sulfur at a temperature of 329 °F and at a pressure of 80 standard atmospheres (1,200 psi). The Super Ball has a very high coefficient of restitution. Dropped from shoulder level, a Super Ball will bounce nearly all the way back; thrown down with sufficient force, it can leap over a 9-story building.
The Super-Ball rebounds proportionally to the amount of force used when thrown at a hard surface. A typical Super Ball can keep around 80% of its kinetic energy in one rebound.
Generic bouncing balls are often sold from bulk vending machines for 25 cents or more.