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 expandable gussets prevent folders from getting caught on folder rails. Three-sided construction protects letter-size documents and assures papers stay in the folders. Tear-drop 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 polylaminate for added durability.