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.