Ultra-versatile organizer can be used three ways: lay it flat, stand it upright, or mount it on the wall to recoup your valuable desk space. Open-ended design allows use with letter, legal and oversized documents or files. Ribs in bottom of each section eliminate slumping. Plastic. Desktop File Folder Sorter Type: Vertical File Sorter; Number of Compartments: 3; Material(s): Plastic; Width: 13 3/8 in.