Since the late 1970's, DFX has manufactured, patented, and supplied gyroscopic exercisers in the United Sates. This 30 year process began with the "Dynabee," However we eventually redesigned the original into our Strengthening System Gyro line, and Extreme Grip Simulators. Today, Powerball Gyros such as the Sports Pro and Platinum are used by professionals for Carpal Tunnel, Rehabilitation, and repetitive stress injuries.