They are made of premium Sponges material for long time and durable use. It has a simple design, but very practical in use, soundproof, great for acoustic absorption, giving you a . Also, also a great room decoration. Excellent acoustic processing, suitable for recording or office wall on the site sound processing. Features -Color:Grey -Material:Sponges -Size:50.00X25.00X5.00cm/19.65X9.82X1.97in - These panels are denser, thicker and more uniform, with better sound absorption. For your soundproofing needs. -Suitable for professional or home recording studios, commercial or home offices, rehearsal Spaces, or home theaters. - Refined appearance shape, making it more creative and decorative, changes will not affect performance. - These soundproof panels can be used for walls, recording ceilings and doors. - You can give it to your family or friends as a practical housewarming present and they will be very happy. Package list: 3 x acoustic panels