C-Line Write-On Poly File Jackets, Straight Tab, Letter Size, Assorted Colors, 25/Box - Unlike Standard Project Folders, the File Jackets are sealed on three sides, providing more protection and room, if needed. These acid-free polypropylene 8 1/2" x 11" files feature a 1-inch gusset, allowing the file jacket to expand. Designer V-cut front provides easy access to documents. Full-length tab and lined front panel feature write-on technology that allows you to identify and organize folder contents. Works with pencil, ball point pen or permanent marker.