Soundproofing Custom Cut Door Sweep for Doors with 20" to 40" Widths - 31" Soundproofing Custom Cut Door Sweep for Doors 20" to 40" Width - 31". Great for Noise Reduction: Help Fulfill Your Doors Full Soundproofing Potential. Soundproofing: Blocks Sound & Drafts From Coming Under the Door. Won't Wear Out Like Mechanical or Flimsey Doorsweeps. Keeps out Critters, too !