1.Material:45#,Q235,other steel 2.Surfac:Chromium,Black Oxide,other 3.Diameter:4~30mm,other 4.Length:10~300mm,other Piston Rod1.Material:45#,Q235,other steel2.Surfac:Chromium,Black Oxide,other3.Diameter:4~30mm,other4.Length:10~300mm,other absorber rod for Motorcycle,Electricity Bicycle,Pneumatic Rod and other