... 2.ISO 9001 certified 3.Low noise,Stable in chemic wheel bearing made in china Material: chrome steel STEEL NO.COMPONENTCSiMnCrMoPS CuNiGCr150 ... ,6700Series,16000Series,6800Series,6900Series,1600Series,1600Series, wider Series, Inch R series,MR Series,RLS series,RMS seriesSpecification:1) Open, ... ) Precision Tolerance: ABEC-1 (P0), ABEC-3 (P6), ABE C-5(P5)4) Noise Level: Z2V1, Z3V2 , Z4V35) Application: ...