... in apparatus,meter and ball bearing etc High technical strength Excellent transmission Sapphire/Ruby Jewel BearingGeneral DescriptionOur ... the manufacture of Jewel bearings Synthetic white corundum, ruby, sapphire, glass, microcrystalline glass, cubic zirconia, natural ... white corundum, synthetic sapphire and ruby bearings, crystallite glass, cube zirconia, nature agate bearings and etc. We can produce ...