Built tough to manage big loads. Patented polylaminate reinforcement makes folder ten times stronger. Features a flat bottom reinforced with pressboard insert. Includes letter size, printer-ready inserts and tabs. Lighter interiors to help prevent misfiling. Dispenser box for quick, one-at-a-time access. 11 pt. stock. Hanging File Folder Type: Box Bottom; Size: Letter; Expansion: 4"; Material(s): 11 Pt. Stock.