Dear Sir, We are one of the leading manufacturer of ball bearings in China. Dear Sir,We are one of the leading manufacturer of ball bearings in China. Please look at the information about our factories. Built: 1985The staff: approximately 1300Quality: ABEC1,ABEC3,ABEC5, Noise level:Z2,Z3,Z4 According to ISO9001Products: Deep groove ball bearings, roller bearings.Materials: chrome steel (Gcr15) ...