... we are Taian zhong rui steel balls co,ltd,one of the biggest steel ball manufacturer in shan dong province,we ... ISO9001:2008 Quality System Ceritficate since the year of 1996.through several years development,quality of TAIAN ZHONG RUI steel balls has approved ... ,please feel free to inform me,Sunshine li,export manager of this company,mobile:0086-13853831016,then we will try our ...