The Screw Ball yo-yo was made in Australia by Abbe Toys but was sold only in Japan under the Tomy brand name. When rotation slowed to a certain rpm, a built-in automatic clutch was engaged, returning the yo-yo to the player's hand. Functionality-wise it is just like a Yomega Brain, the original auto returning yo-yo.
Tomy also released the Screw Ball Mini, also seen in this museum.
