Pendaflex SureHook Hanging File Folder features built-in tension springs to ensure that rods are strong, sturdy and will bend less. Letter size file folder with 1/5 cut tabs and inserts has reinforced polylaminated top and bottoms. Acid free and PVC free folder stays on the rails, slides with ease and will not buckles under pressure. Paper made from 10% recycled fiber with at least 10% post-consumer fiber. Pack of 20.