![]() Due to their low cost per unit, bouncy balls with logos or other designs are sometimes used as promotional merchandise. Balls similar in size and composition to Spaldeens, but featuring a plethora of designs (such as a baseball pattern, miniature basketball and soccer ball patterns, and so forth) are offered by many companies. Nerf balls, introduced in 1970, are also small balls that bounce, but they have a lower coefficient of restitution than a typical bouncy ball. ![]() Skyball is a brand of hollow medium-sized bouncy ball filled with a mix of helium and compressed air, claimed by the manufacturer to have particularly good bounce characteristics. Superballs are often smaller than a Spaldeen. They were first sold by the Wham-O toy company under the name Super Ball, which remains their trademark. ![]() A superball or power ball is a bouncy ball composed of a type of synthetic rubber (originally a hard elastomer polybutadiene alloy named Zectron) invented in 1964, which has a higher coefficient of restitution (0.92) than older balls such as the Spaldeen so that when dropped from a moderate height onto a level hard surface, it will bounce nearly all the way back up. ![]()
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