This product can greatly reduce the noise in the case of moderate noise reduction. Wear-resistant, dust-proof, shock-absorbing, radiation-proof and breathable. Long service life, strong elasticity and durability. Very suitable for use on walls, ceilings, doors, windows, vocal booths, control rooms and studios or home entertainment centers, etc. Helps to stop the sound and prevent echo anywhere in the room. Shape: square Form: Layered colour:Black Material:Polyurethane foam size:30 x 30 x 2.5mm Package Contents: 18 x sound insulation cotton Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.