Color box packing as custer requested
Low friction coefficient and wear resistance. It is self-lubricating when it is used as a moving mechanical component, and the noise is low. When the friction is not too high, it can be used without a lubricant. If it is necessary to use a lubricant to reduce friction or help heat dissipation, water oil, grease and the like can be selected. Thus, as a transmission component, its service life is long.