Designed with rip-proof tape, Pendaflex extra-strong acid-free file pockets can stand up to the rigors of your office. They also come in a vibrant red color, making them easy to locate. Design includes a double-thick manila-lined front and back for greater strength. 6 1/2" high fiber gussets are reinforced with rip-proof tape at the top. Red, 30% recycled, acid-free file pockets come in a box of 50. SFI Certified Sourcing. Greener choice - contains 30% postconsumer recycled content. Letter-size, 8 1/2" x 11", file pockets with 3 1/2" expansion to meet your filing needs.