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 and three dividers with tabs for categorizing contents with tab inserts included. 3-1/2" expansion file pockets also feature a double-thick front, manila lined back and moisture-resistant coating.