... Product Description Deep groove ball bearing 1.Material:GCR15&GCR12 2.Market:Mid East,Africa 3.competive pr Deep groove ball ... ,RZ,2RZ,RS,2RS2.Quality level:reach the same level as tyhe Japanese and European beaings3.Tolerance level:ABEC-1(po),ABEC-3 ... (P6)4.Noise level:EMQ V1 Z2,EMQ V2 Z3 ...