... : G10 ~ G1000 Size: 0.6mm-250mmMaterial: carbon, stainless, chrome application:wheel, caster, slider, bearing,bicycle, motorcycleOEM ... which has extreme toughness and corrosion resistance. Carbon steel ball MaterialSizeGradeHardnessAISI 10150.8mm-180mmG10-G1000HRC> ... -G1000HRC>58AISI 10850.8mm-180mmG10-G1000HRC>58Material: carbon, stainless, chrome application:wheel, caster, slider, bearing,bicycle, ...