With the advancement and intelligence in compressor technologies, such products are moving towards higher efficiency, more functions and longer life. Therefore, there are more combinations of gear design including traditional external gears, internal and external gears, non-involute gears, etc. Besides, the quality requirements for precision gears are also getting higher and higher. With the most complete gear portfolio, production processes and 45-year experience, Six Star is able to produce extremely low-noise or even noiseless gears, which can be applied in two major fields (1) industrial air / hydraulic products and (2) automotive air/hydraulic products and systems. Our products have been installed on the air & hydraulic equipment of well-known manufacturer in the world.