... years 2.High hardness 3.Good wear resistance 4No spots,Shinning as mirror We are specialized in the production ... visual visible crack, defects such as corrosion, used in home and abroad quality casters, bicycle, force of car ball.4. Pressure ... and automobile parts,slide bearing,caster wheels,computer peripheral products,toys,metal milling,hand tools and etc. G500 soft carbon steel ball made in china ...