The piston rod of this product is precision machined, with good wear resistance, surface roughness below Ra0.02um, high hardness, high quality piston rod and high performance sealing device to ensure the long-term life of the nitrogen spring. The product has been tested by the National Center for Automotive Quality Supervision, and the quality is qualified. After completing the effective stroke, the decompression rate is below 5%, which is fully attached to the international standard.