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.