1.Inner diameter:1mm-12mm 2.Stainless steel:AISI440C, AISI304, AISI316 3.ABEC-1 ABEC-3 ABEC-5,ABEC-7 4Noise level:Z1,Z2,Z3,Z4 High Performance low noise miniatrue stainless bearings1.Model:Open,Z,2Z,RS,2RS,RZ,2RZ2.Quality level:Reach the same level as the Japanese and European bearings3.Tolerance level:ABEC-1(P0),ABEC-3(P6),ABEC-5(P5),ABEC-7(P4)4.Noise Level:EMQ V1 Z2, EMO V2,Z3, EMQ V3 Z4,EMQ ...