The ring gear is composed of coated card clothing and aluminum-magnesium alloy rings. The weight is only 1/2 of the steel ring, which can effectively reduce energy consumption and weight. Since the surface coating of the card clothing is composed of nano-scale diamond, the diamond particles are brought into the coating through a special process, making the needle tip brright smooth, sharp, HV1200-1300, and extremely wear-resistant. It is widely suitable for spinning various fibers, especially for spinning higher-grade fibers, with better results.