The Top Spin is a thrill ride developed by HUSS Park Attractions and Mondial, and is the generic name for a series of rides from other manufacturers that follow the same principle. The ride consists of a passenger platform suspended between two counterweighted arms. The arms are turned by motors, while the platform typically only has brakes that are engaged and disengaged at various points of the ride cycle. A typical top spin program runs the main arm motors while engaging and disengaging the platform brakes so that it will rotate in exciting ways. The minimum rider height requirement is 54 inches; maximum is 80 inches due to the seat and restraint design. The ride was introduced to the public in 1990 and proved an instant success with European fairgoers.