1.two working rooms 2. Material: Stainless Steel(304#) 3.Board computer control Double Chamber Vacuum Packing Machine are made of stainless steel , its vacuum room is quite thick stainless steel plate. The maximum sealing size is 800mm. When in long term usuage, it doesn't deforme and air leak. Main Features1. The material of the machine is 304 stainless steel, the steel plate is extra heavy, ...