Bottom and 6 1/2" high side gussets are fully lined with Tyvek? to deliver incredible durability needed for heavy, active files. Back of pocket lined with 11 pt. Manila stock for added strength and easy identification of subject heading. Bottom and sides fully enclosed. Drop front style offers convenient access to contents. Straight cut tabs. This product was made using wood sourced from a certified managed forest. Expandable File Folder Type: Drop Front; Top Tab Pocket; Size: Letter; Width: 11 3/4"; Height: 9 1/2".