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 displays total revolutions in multiples of 100s, current speed in RPM, historical top speed in RPM, and a physical strength index that counts down in 30, 60, and 90 second intervals for a total number of revolutions in that duration