DZQ-600B Vacuum Sealing Machine is an extra large capacity floor model vacuum sealer designed for heavy duty commercial market. it is equipped with two sealing bars (three sealing bar and cutting function is available as optional),and user adjustable controls for vacuum cycle, seal bar temperature and cool-down timing. Additionally,DZQ-600B has a wide, long, very deep vacuum chamber that will accomodate very large packages or many smaller packages in one sealing operation greatly increasing productivity.both sealing bar are600x10mmin size.This is the perfect vacuum sealer for large cuts of meat and whole fish. Plus, a letter and number kit is included which will allow date and text message identification to be embedded in the sealing of each package. A great way to set "freshness" markings. Other than periodic replacement of pump oil which is included with the unit, no other user maintenance is required.