... )Material: Gcr15, Bearing Steel, Carbon Steel, Chrome Steel2)Cage Material: Brass, Stainless Steel 3)Quality standard: ISO9001 4)Noise standard: Z1 ... , 6304, 6305, 6306, 6307. 6308, 6309, 6310;6400 Series:6403, 6404,6405,6406,6407,6498,6409,6410,6411,6412. Production Ability ...