... : OPEN,RS,2RS,ZZ,Z,RZ,2RZ, 2.Material Plastic Material 3.Quality standard: ISO9001:2000 4..Accuracy grade: ... , ABEC-5, ABEC-7) 5.Noise level: Z1, Z2, Z3,Z4 6.Vibration level: V1, V2, V3, V4 7..Inner ... bearing, Z, ZZ, RS, 2RS.5) Vibration and Noise level: Z1, Z2, Z3. ZV2, ZV3, Z2V2, Z3V3.6) Precition ... level: ABEC1, ABEC3, ABEC5,ABEC7.7) Files usd in; Motocycle, ...