Powerball Hybrid Pro combines the power of a Metal Series rotor with the robust, lightweight shell of a standard model. Designed for improving grip strength, muscle endurance and joint resistance. Includes LCD speed counter and Powerball Case. Metal Hybrid Encompassing a solid, heavyweight zinc rotor inside a smoked-black, military-grade polycarbonate shell,  Hybrid successfully combines the classic appearance a standard Powerball with all the power of a Metal Series model.  Autostart Fitted with an autostart mechanism for quick activation and fuss-free spinning every time. Simply wind back the rotor, release and spin. No strings needed! Speed Meter Hybrid Pro includes a 4-mode battery-free speed counter for precisely monitoring your strength progress, endurance gains and highest spin speeds. Pure Strengthening Hybrid can generate a massive 27kg in resistance and is built for pure strengthening. Feel the burn in your forearm and hand as you spin this powerful gyroscope and benefit from