We examine every piece of bearing by ourselves before supply. It has recognized stable cooperation with many properly recognized universities and institutes in china these kinds of as, Zhejiang College, Jilin College, Specialized committee of countrywide chain generate standard, Institute of nationwide chain travel, Zhejiang software engineering material institute, Huhan material security institute and it cooperated to found China Very first Auto chain institute with National chain push institute.Moreover, all our manufacturing methods are in compliance with ISO9002 standards.