Efficient Soundproofing: The 30kg/m³ high-density polyurethane foam effectively absorbs high-frequency sound waves, improving the absorption of vibration echoes, reverberation, and noise, which helps reduce noise pollution and enhance sound clarity. NOTE: Vacuum packed. Please let it sit to regain shape. Feel free to contact our customer service if you have any questions. Reaction to fireclassification: E Excellent Performance: This material boasts multiple superior qualities, including soundproofing, and safety. It quickly rebounds after being opened, maintaining its full shape without collapsing, and remains stable even with long-term use. Built-in Strong Adhesive: It adheres firmly over time, suitable for use on materials like tiles, marble, and metal. The product is lightweight and can be installed in three simple steps, making it practical and easy to use. Various Specifications: Includes 4 wedge-shaped foam panels, covering 3 sq.ft. You can purchase the appropriate quantity based on your needs, reducing noise while beautifying your indoor environment. Wide Applications: The three-dimensional structure allows sound waves to be reflected and scattered multiple times when they hit the recessed surface, effectively reducing noise. The sound dampening panels can be widely used in recording studios, home theaters, offices, and more.