QuietRock 545 is the world’s leading soundproofing drywall panel. Each panel is multi-layered and weights more than 210 lbs/85kg. This multi-layer gypsum panel engineered to provide maximum sound attenuation across a broad frequency range. QuietRock 545 can be used in virtually any application and ideal for projects requiring high STC performance at low frequencies. QuietRock 545 is recommended for commercial theaters, studios, and sound rooms. Special 1 and 3/8” thick drywall sheets for soundproofing. These things are heavy and expensive. They are multiple layers of drywall glued together with sheet metal in between. A specialty Sheetrock for sound proof rooms. Our loss is your gain. Price is per sheet. Get it while it lasts. These are very heavy specialty sheets. I only recommend if you have experience with this product.