.5 Lb Density Mass-Loaded Vinyl 4' x 50' Roll 200 Sq Ft - MLV SoundProofing/Sound Deadening Vinyl Sheet Noise Barrier - Made in the USA! 200sq ft 4'x50' BLACK - Dense .5lb Per sq Ft - Polymer MLV barrier made from post-industrial recycled products - Made in the USA! Flammability Rated UL94 S.E. "0"; Passes test MVSS-302; .80" Thick for excellent sound deadening - Hi Performance STC 20 Tensile Strength - 400psi Tear Strength - 70lbs/in. A "Green" recycled product for use in walls, ceilings, and floors (non-toxic)