... bearing typeDeep groove ball bearing feature1) Model: Open, Z, ZZ, RZ,2RZ,RS, 2RS 2) Quality level: reach the same level as the ... -1 (P0), ABEC-3 (P6),ABEC-5(P5)4) Noise Level: EMQ V1 Z2, EMQ V2 Z3, EMQ V3 Z4, EMQ ... the conditions. Change,please connect with our engineers.Bearing collarand ball materidl The best material for bearing is high carbon chromium ...