This is the cart that is an optional item for the Martin Yale Mark VII Pro Series Folders. When you order on this page, you are ordering the CART only. If you are interested in ordering the Martin Yale Mark VII Folder, there are two models. the MK7000 which is a Friction Feed Folder, i.e. it works by using friction to move the sheets of paper, and the MK7000A which is a Mark VII Air Feed Folder, and uses air to move the sheets of paper being folded. Information on the Martin Yale Air Feed MK7000A, the Martin Yale MARKVII Pro Series Air Folder is below. For the reference you can visit Frictino Feed MK 7000 and MK7000A - Air Feed.