Dynaflex Amber Power Ball - DYN12050C

"This Dynaflex Amber Power Ball features a balance rotor and removable top cap, which allow insertion of the optional digital speed meter. The Powerball generates 35lbs of torque with speeds up to 13,000 RPM. By activating the gyro, a dynamism (motion) is created, which will activate LED lights in Amber which are located in the interior of the gyro. The faster the unit runs, the brighter the lights will be until the whole hand is engulfed in a bright glow. Just when you think you've seen it all, along comes the ultimate hand, wrist and arm exerciser."