Have Fun Strengthen Hands, Wrists and Forearms in a Minute a Day With the NSD Power Gyroscopic AutoStart Spinner, you can get the same results in just a few minutes a day as you would if you spent hours per week in the gym. This compact hand, wrist and forearm exerciser features a gyroscopic core that spins at over 15, 000 RPM and provides up to 24. 9 pound-inch of torque to give your body the resistance required for fast, measurable results. It's perfect for athletes looking to zero-in on hand strength, and it may even prevent and relieve repetitive stress-induced injuries, such as carpal tunnel and tendonitis. A Full-Featured Hand-Held Exerciser for Rugged, Long-Lasting Use This high-tech NSD Power Spinner is equipped with all the bells and whistles for simple yet intense hand, wrist and forearm training. It has an internal pre-tensioner that triggers AutoStart plus a built-in LCD display that allows you to keep track of your most important workout stats, including your historical top speed (*LCD display features on the model PB-688AC Black ONLY). Plus, like all of our hand-held exercisers, this model is made from the most rugged materials — including a military-grade plastic shell and reversible inner tracks — to keep it in its best shape even if dropped.