Wilson Jones Slidebar File with Expanding 13 Pockets, Poly, Letter, BlackStore important documents safely with this expanding file that does double duty as a mobile file. Just retract the hanging hooks, then transporting is easy without snagging or tearing. Multiple pockets help organize paperwork. Tear- and moisture-resistant polypropylene protects documents. Hanging File Folder Type: Specialty with Retractable Hooks; Size: Letter; Expansion: 15"; Material(s): Polypropylene.