The OEM Extra Strong File Pocket is designed for durability and efficiency. Constructed with double-thick, manila-lined front and back for greater strength, it is made of extra-strong, acid-free red fiber material. This file pocket features a 5-1/4" expansion and 6-1/2" high fiber gussets reinforced with rip-proof tape at the top, ensuring reliable performance. Made with 30% post-consumer materials, it is an eco-friendly choice for your filing needs.