Pyramid-shaped black foam panels, ideal for sound absorption. 48 pieces. - Color: Black - Material: Foam - Shape: Pyramid - Size: Approximately 30cm x 30cm x 5cm - Application: Sound absorption Purchased on Amazon. I applied them to the ceiling, but I have some left over, so I'm selling them. There are 2 packs of 24 pieces each. They are new. Adhesive is included. I used 4 packs for the ceiling of a 6-tatami mat room. Thank you very much.