Hanging Pockets offer extra capacity and SureHook technology with revolutionary, built-in tension springs. This design makes sure pockets stay on track, slide more easily and don"t buckle under pressure. Full-height gussets prevent folders from getting caught on folder rails. Three-sided construction protects letter-size documents and assures papers stay in the folders. Slots on front and back panels accept tabs (not included) in five positions. Folder is made of 11 point paper stock and expands 3-1/2". The top of the folder is reinforced with poly laminate for added durability.