Heavy-duty tough expanding files are virtually indestructable. Double thick front and back panels with heavy reinforced liner board for added durability. Tyvek? reinforcement at the top and bottom for extra strength. Gussets extend into front and back panels twice as far as standard. Choose from alphabetic (A-Z), daily (1-31) or monthly (January-December) preprinted indexes. This product was made from wood that came from a certified managed forest. Expandable File Folder Type: Indexed; Open Top File; Size: Letter; Width: 12"; Height: 10".