Premium file pockets feature plastic hooks that swing out to file on rails stabilizing files in the drawer. Hooks swing down out of the way for active use. Unique double-reinforced cross-bonded rip-proof spun-polyester gussets offer total strength and flexibility. Tops are laminated for extra reinforcement. Red fiber file pocket also has tape reinforcing strips at critical wear points. File pockets also feature a double-thick front manila lined back and moisture-resistant coating.