Jan-Dec Open Accordion Expanding FileHeavy-duty leather-like 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 files. Choose from alphabetic (A-Z), daily (1-31) or monthly (January-December) preprinted indexes. Expandable File Folder Type: Indexed; Open Top File; Size: Letter; Width: 12".