Black pyramid-shaped foam panels with soundproofing and sound absorption effects. They are 30cm x 30cm and about 7cm thick. This is based on subjective experience, so please refrain from claims. - Color: Black - Material: Foam - Type: Acoustic Panels - Shape: Pyramid Thank you for viewing. I'm selling these at a bargain price because I'm just going to throw them away without using them. Shipping costs will be a bit high, so the price is almost the shipping cost. Thank you. I have only opened them, and they have never been used. I am a non-smoker and do not have any pets. Thank you.