TMS Mass Loaded Vinyl 4' X 10' (40 sf) 1 Lb MLV Soundproofing Barrier. Highest Quality! Best Seller, Super Heavy - Made in the USA! 1/8 of an inch thick - 27 STC - Highest Quality! No odor - Extruded Virgin material (no regrind or recycled material). Perfect for Apartments, Automobiles, Bathrooms, Studios, Classrooms, Pipes and more 4 feet wide by 10 feet long