Item Description 12 pcs 47" which covers 59.7 sq. ft. Blue Label.#416001 Rockwool ComfortBatt is a stone wool insulation specifically engineered for use in 2x4 exterior walls, cathedral ceilings, attics, basement walls, exposed floors, and heated crawl spaces. Easily cut. Non-combustible. Excellent sound absorbency. Does not rot, or sustain vermin . Does not promote growth of fungi or mildew. Low moisture sorption. Chemically inert;. non-corrosive. Water resistant. CFC-and-HCFC free, product and process.