SSP Gray Door Sound Proofing Tape 1/4" to 1/2" widths (25 ft- 1/2" wide) Super Soundproofing Door Soundproofing Tape Bring your door up to it's full soundproofing potential! Seal it's edges! It is 25' Self Adhesive Door Seal Tape One roll of 25' for one door. 75' seals 3 doors.