All of our machines are created of high quality materials, it involves 2T welding then milling built-in molding frame, Japanese 20CrMnTi CNC precision machining cam , 4-axis CNC machining clamp and aviation aluminum engraving and milling vacuum chamber, which make certain with the long existence cycle of our machine. https://socdirectory.com/listings656109/new-step-by-step-map-for-vacuum-packaging-machine