... supply all kinds of electroplate balls. zinc-plated, nickle- plated, chrom-plated, copper cover Model Number2mm-50mmApplicationtoy, anit-rust purposeShapeshperialMaterialsteelDimensions2mm-50mmChemical ... trust bearing pulleys Copper Plated Ball/zinc-plated, nickle- plated, chrom-plated, copper covered ball Copper Plated Ball,