Soundsulate Mass Loaded Vinyl 4' X 25', 100 sq ft 1 lb MLV, Soundproofing, Noise Block, Made in USA STC rating 27, 1/8" thick Made from virgin material (no recycled content), odorless. Use for soundproofing basements, conference rooms, studios, apartments and more High quality, made in the USA Heavy - weighs 1 pound per square foot