If you are a professional boxer, extreme athlete, or need to build upper body strength, this is a unique and challenging exercise. With progressive exercises, it can be a good way to increase explosive power, boxing speed and help break through bottlenecks. Benifits： 1.Adjustable resistance to meet the needs of all types of people. 2.Stainless steel material, electroplating process, durable. Adjust the resistance to change the weight. 4.Excellent grip and easy to carry. Daily maintenance and common problems： 1. If the hands sweat more in summer, please wipe with a dry towel after training to effectively prevent rust and extend the service life. 2. Because the factory added high temperature resistant solid grease and mechanical lubricating oil, if the side ring at the beginning of training with oil spills is a normal phenomenon, do not worry about damage, wipe the side ring with a towel can be, this is a break-in process, please rest assured that use.