.* Soft sponge, no dust, high density.* Excellent flexibility. Non-toxic.Powerful sound absorption.* Designed for durability and easy installation.* Square sound-absorbing sponge with beautiful appearance and good acoustic performance.* Used to absorb medium and high frequencies and reduce echo. Coefficien general noise cancellation.* Good for studios, recording studios, vocal booths, control rooms. Specifications:Size: About 30*30*5cm/11.8*11.8*1.96inMaterial: Polyurethane SpongeType: Acoustic Foam Color:Black,Grey,White,Blue,Red,Yellow,Purple (as shown)Package List:12 x Sound-Absorbing FoamNote:Please allow 1-5mm error. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!The product is deformed due to logistic extrusion. Don't worry, it can be restored to its original shape after being placed for a period of time and can be quickly restored by submerging in water.