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Top-ranked sound blocking technology with a proven 26 STC rating. Great for walls floors ceiling doors home theaters automobiles boats and RVs. Reduces neighboring and outdoor noises from entering your space. 1/8 thick nominal one pound per square foot 4.5 feet wide by 30 feet long 135 sf. Weighs 135 lbs. Non toxic safely use anywhere. Will not decompose or off-gas. Easy to cut and install. Made in the USA Soundsulate mlv material is one of the best soundproofing options available today. Soundsulate MLV is the superior solution over other soundproofing alternatives for blocking sound effectively. The very thin and flexible characteristics makes it an excellent choice for a variety of sound control applications without compromising space. It is designed to reduce transmission of airborne noises and vibrations through floors walls and ceilings. Typical applications include applying over studs joists or suspended ceilings. It can also be used as an acoustic wrap for machinery equipment and ductwork.