Our company has completed development of assembly design software and manufacturing technology for overall crowned super precision roller, relieved end roller, needle roller and variant-curvature crowned super precision roller (logarithm curved super precision roller) to ensure the lifespan of products and to decrease vibrancy and noise of products by times. The products facilitate bearing rollers for car manufacturers such as Shanghai Volkswagen, Audi, Buick, Citroen, Isuzu etc.