McKaison is a brand of Changxing Rice Valley Trading Company. Unlike traditional wrist strengths, McKeson wrist strengtheners are a type of wrist balls. It is a purely mechanical device, which relies on the rotation of the wrist to drive the ball core to rotate at high speed, thus generating strong force. By human control, the speed of the rotation of the ball core can be adjusted, and the faster the speed, the greater the force generated. Grip the rotating wrist power ball with both hands to achieve the workout effect. However, there are also disadvantages, it is more troublesome to start, noisy, and easy to blister your hands. The price is moderate, starting at 27 yuan, which is suitable for users who like novel ways to exercise. If you like wrist balls, it is recommended to buy wrist balls with metal shells, which are more durable.