Flat manila letter size file is enclosed on three sides, creating a jacket. The jacket includes full height gussets, and features the 1/2" high, two-ply reinforced, straight-cut tab with thumb-cut design allows easy access. Contains a minimum of 30% recycled post-consumer content, with a total recycled content of 30%. Acid free. UOI is BX. BX = 100 file jackets.