It's in beautiful condition. Operation has been confirmed. The metal material is safer and more durable. Metal materials have a greater sense of weight than plastic. Noise during rotation is reduced. A dedicated case is included. Immediate purchase is welcome. Thank you. Wide range of uses and target audience: Snap balls are useful not only for sports training such as golf, kendo, baseball, basketball, badminton, and bowling, but also for strengthening the fingers and arms of those involved in music, such as guitar, bass, drums, and piano, as well as for rehabilitation and stress relief. It is also ideal for exercise support for office workers and can be used by a wide range of people regardless of gender or age. Innovative training to build muscle strength with gyro rotation: The snap ball generates centrifugal force by high-speed gyro rotation, and by grasping and controlling it, it is a training device that efficiently trains grip strength and arm strength. Unlike conventional types, there is no need to wind a string, and it can be auto-started simply by rotating it in one direction and releasing your hand.