Extra-Heavy Red Fiber Expansion Shelf File Pockets give you the room you need for growing projects with the easy access that drop fronts provide. Made of extra-heavy-duty, acid-free, 17 pt. red fiber stock with straight tabs, scored sides and rip-proof tape reinforced gussets to stand up to the demands of the busiest offices. Expansion shelf file pockets are SFI certified as helping to provide sustainable forest management that promotes exceptional conservation value.