History of bouncy balls

Bouncy ball, power ball or super ball is a small polybutadiene rubber bouncing ball which rebounds proportionally to the amount of force used when thrown at a hard surface. Bouncy balls can bounce over three stories high when thrown at the ground. The first such ball was the proprietary Super Ball, and another was the larger, helium-filled Skyball.
The bouncy ball was patented in 1966 by a California chemist named Norman Stingley.[1] In 1965, Stingley spent his spare time experimenting with rubber. He compressed various scraps of synthetic rubber together under about 3500 pounds per square inch of pressure. The result was a compressed rubber ball with an extreme resilience and high bounce.
In some countries, for example the United States and Denmark, they are often sold from bulk vending machines.

Source-https://en.wikipedia.org/wiki/Bouncy_ball