This OEM Extra Strong File Pocket features a double-thick, manila-lined front and back for enhanced durability. Constructed from extra-strong, acid-free red fiber material, it offers a 3-1/2" expansion with 6-1/2" high fiber gussets that are reinforced with rip-proof tape tops. Made with 30% post-consumer materials, this file pocket is designed to withstand heavy use while being environmentally friendly.