Introducing the unique new NSD Power®Ball Recommended by Chiropractors and Physiotherapists, the NSD Power®Ball is a fully dynamic training - rehabilitation product that takes your wrist through the actual ranges of its motion while simultaneously adding resistance. Its unique 'non impact' properties gently stress damaged areas in a perfectly smooth and balanced manner which cannot be replicated by traditional exercise routines or therapy. It works every muscle in the forearm in every direction, including eccentric - its smooth rolling motion also improves flexibility and blood flow in the wrist but with zero impact on the joints and will help in the prevention and rehabilitation of RSI, Carpal tunnel and Tendonitis. The resistance level generated by the ball is directly related to the speed at which you spin the internal rotor, so you can use your NSD Power® Ball at your own pace and without further risk of damage to existing inflamed areas. NSD Power®Ball is available in a variety of models and features: Classic: Loaded with a high performance 250Hz rotor. Neon: Loaded with a high performance 250Hz rotor, Neon models have an added feature of 6 inbuilt ultrabrite LEDs which glow brightly once the NSD Power®Ball is spinning. Pro: Loaded with a high performance 250Hz rotor, Pro models come complete with an inbuilt digital speed meter. Included is a CD showing how the product works.