1.3.936 CARBON BICYCLE stel balls 2.Material: Gcr15/ AISI 52100 / 100Cr6 3.Precision ... high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings & micro – ball for the electronics industry.. 2 ... - speed, low noise special bearing good quanlity 3.936 CARBON BICYCLE STEEL BALLs