Material: refined chrome steel (Gcr15 -AISI E52100) Accuracy: Standard Tolerance Class China GB/T307.1 P0 P6 P5 ISO 0 6 5 ANSI ABEC-1 ABEC-3 ABEC-5 Very Low Vibration: two levels of V2 & V3 Very Low Noise: three levels of Z2, Z3 & Z4 Clearance: four groups of C2, C0, C3 and C4 PRICE QUOTE ON REQUEST