This is a case of 4 pieces of 24 x 48 x 2 inch Rockboard 60, manufactured by Roxul. It is rigid mineral wool board with a density of 6 pounds per cubic foot. Rockboard 60 is a great option for acoustic projects that require a rigid material. It’s also used in some bass trap designs. PRODUCT SAFETY INFORMATION - Warning: Can cause respiratory, skin and eye irritation. Precautionary Measures: Avoid breathing fiberglass dust and contact with eyes or skin. Wear long-sleeved, loose fitting clothing, gloves, respiratory, and eye protection when working with this product.
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I can't believe people don't buy more of this stuff. Forget the egg-crate style foam. You need something heavy to get the job done. Heavy foam is too expensive for a lot of people. Mineral wool works great for less money and is a lot more pleasant to handle than fiberglass insulation like Owens Corning 703, etc.