... competitive price Material: Iron/Alluminum, Copper, Alloy, Carbon steel, 18CrMnTi,20CrMnTi Cylinder with high quality and competitive price1):Production machine:most ... , etc.;8):Material: Iron/Alluminum, Copper, Alloy, Carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV,1045 steel, Others optional;9):Surface processing technics ...