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Dynaflex Pro strengthens your wrists forearms etc. Designed with a high performance rotor which can reach speeds up to 13 000 rpm s and puts out 38 lbs. of torque it aids in the prevention of repetitive strain injuries and carpel tunnel syndrome. It improves coordination while building strength. Weighs 9 oz. Made in the USA. The Pro Plus comes with a removable top cap which allows the insertion of the optional speed meter. When attached to the Pro Plus the speed meter gives the user the option to have 3 separate working programs through the digital functions: measures the user s current speed user s highest rpms and maximum revolutions of the gyro.