Qty: 8PCS 4.6" x 4.6" x 9.4" good for studios, recording studios, vocal booths, control rooms. Very Good Quality High NRC !! Product Care: Occasional Vacuuming of Dust. This product provides strong noise reduction, Good for studios, recording studios, vocal booths, control rooms. acoustical foam is a cost-effective. Our foam can be aligned perfectly with the next piece to provide professional installation. Use: Perfect for use on corner walls, corner ceilings, etc. Anywhere to help block sound and prevent echoes inside the room. Best When You Cover The Corner From Top to Bottom, with this Product.