1 Lb Density Mass-Loaded Vinyl 4' x 25' Roll 100 Sq Ft - MLV SoundProofing/Sound Deadening Vinyl Sheet Noise Barrier - Made in the USA! BLACK - Very Dense 1lb Per sq Ft - Polymer MLV barrier made from post-industrial recycled products - Made in the USA! Passes test MVSS-302; Flammability Rated UL94 S.E. "0"; .100" Thick for excellent sound deadening - Hi Performance STC 26 Tensile Strength - 400psi Tear Strength - 70lbs/in. A "Green" recycled product for use in walls, ceilings, and floors (non-toxic)