As people's living standards continue to improve, more and more people are entering various sports fields in addition to busy work. On the other hand, the development of competitive sports now requires sports R&D personnel to pay attention to the improvement and development of sports equipment while stressing scientific training. Due to its maintenance-free and self-lubricating, Seleilte? plain bearings are clean and wear-resistant, and have shock absorption and noise reduction for a comfortable and easy-to-use experience.