1.Strictly according to IATF 16949 quality certification system process production.    2.The advantages of automatic welding ensure the reliability of welding strength, no leakage stability, installation position accuracy.                                                  3.Teflon piston-ring integrated whith piston,not only reduce the friction and noise,also avoid inner-leakage.                        4.Unique gas-charge method by injecting the gas from the bottom,meanwhile,sealing it by projection welding.It can ensure the consistency of gas pressure and no damage to the oil-seal lip.                                         5.Gas-filled shock absorber injected with pure N2,which not only keeps stability of damping force,but also reduce aerification and foaming,meanwhile,extend the effective life.                                                         6.Hard-chromed piston rod with micro-grooves,increasing the rigidity and reducing friction,keep better lubrication action.               7.Advanced multiple-type bottom valve system structure,guarantee multiple damping forces realized and match the suspension system better.                             8.High-quality working liquid,ensure all-weather adaptability under different temperature conditions.                         9.Automatic paint surface-system lines,assure weatherproof under all different conditons and excellent appearance.               10.only produce Brand New & real ADS air spring strut products.  When you choose supplier, we suggest you to buy try order to test their quality.