NSD Power Ultimate Winner's Precision Sterling Spinner Gyroscopic Wrist and Forearm Exerciser with Digital Speedometer, Lightweight Aluminum Rotor and Stainless Steel Shell Hollow aluminum rotor in conjuction with high end rotor track material and rotor bearing makes this the FASTEST Spinner ever Stainless steel shell construction anodized in gold color and polished to a mirror like shine for that ULTIMATE, classy look. Computer balanced inner gyroscopic rotor for VIBRATION FREE operation at up to 27,000 RPM Ideal as a complimentary Spinner to PB-588C or other Spinners to improve fast twitch muscle response, while PB-588C or other Spinners improve muscle strength Performance Digital LCD counter SM-02 displays total revolutions in multiples of 100s, current speed in RPM, historical top speed in RPM, and a physical strength index