... speed, OEM Services are Welcome, Suitable for Household Appliances Miniature ball bearingsMaterials: GCr15-China, (AISI) 52100-American, (Din) 100Cr6-Germany Types ... , C0 and C3 Precision level: P0, P6, P5 (ABEC1, ABEC3, ABEC5) Noise level: Z1, Z2 and Z3 Vibration level: V1, V2 and V3 ... If you want to more information, pls contact me. Miniature Ball Bearings 608ZZ,608-2RS