Have used these for our gymnists for years. Best excersise for making wrists strong.
Starting in the late 1970's, DFX was the first to patent, manufacture, and supply gyroscopic exercisers to the U.S. This 30 year process began with the "Dynabee," however we eventually reconstructed the original into our top selling Strengthening System Gyro line, and Extreme Grip Simulators. Today, Powerball Gyro's such as the Sports Pro and Platinum have evolved into miracle medicine for Carpal Tunnel, Rehabilitation, and repetitive stress injuries.