This flawlessly finished, mirror-chrome masterpiece includes a two-piece magnetic display case. The NSD Power is able to generate 21,000 RPM and delivers up to 60 pounds at of silky-smooth dynamic resistance in the palm of your hand. Whether you want to take your game to the next level,need to recover from a hand or arm injury, or simply want to sculpt, shape and tone your body, the faster the gyro exerciser spins, the more resistance (or weight) is automatically added.