Convoluted Charcoal Egg Crate Acoustic Soundproofing Foam (2) 82"x54"x 2-1/2" Thick Charcoal Eggcrate Acoustic Soundproofing Foam (2) 82"x 54"x 2-1/2" Thick Made in the USA, 1.8 lb Density and ILD of 70 (WEDGE NRC.80 OVERALL) (PYRAMID NRC .70 OVERALL) Excellent choice for sound and noise control and also reduces reverberation. Recommend for: Recording Studios, Home Theaters, Broadcasting Studios, and many other Industrial and Commercial Applications. Our Acoustic foam panels provide affordable insulation and noise control suited to many environments. Our product meets California 117 flame retardant specifications, and is class B type