... OriginShandong, China (Mainland)Brand NameModel Number1/8" , 5/32", 3/16", 7/32", 1/4", 4mm, 5mm, 6mmapplicationbicyclematerialcarbon steel ballsize ... : 1/8" , 5/32", 3/16", 7/32", 1/4", 4mm, 5mm, 6mm MaterialAISI 1010- ... 1015, AISI 1055, AISI1085Size1/8" , 5/32", 3/16", 7/32", 1/4", 4mm, 5mm, 6mmGradeG200, G500, ...