The large area of thin foam will not cause sound reverberation and distortion. The uniform wedge design helps to capture airborne noise while reducing flutter and counterattack. This kind of foam is perfect for live production studios, practice rooms or home entertainment centers. Moreover, this foam helps reduce the complications of stirring . After testing, it can effectively sound waves and vibration. Purchasing your own foam is the to adjust the area without hiring a professional acoustician. The foam will not deteriorate or decompose over time. All it takes is a long period of dust removal. Features: sound absorption, heat preservation, heat insulation, good elasticity, wall decoration, shockproof, moisture-proof, anti-friction. Scenario: It can be used in residences, recording rooms and home theater schools, hospitals, , automobiles, ships, architectural decoration, household appliances, etc. size: 30x30x2.5cm Material:sponge colour:Black + purple Package Contents: 12 x Black soundproof cotton 12 x purple soundproof cotton Only the above package content, other products are not included. Note: Light 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.