one-step molding tube,avoid from tube broken 30,000cycles,5years ISO9001:2008/SGS/TUV fatigue test cheap price,fast delivery Our major is gas spring, compression gas spring, free gas spring, lockable gas spring, locking gas spring, elastic lockable gas spring, rigid lockable gas spring,gas struts and door closer. Our gas springs can be widely used in furnitures,automobiles,food equipments and etc ...