24 PCS Acoustic Foam Wall Panels Soundproofing Sound Proofing Tiles Studio Decor Features: High-Density Flame-Retardant Material: The sound absorbing foam panels is made of flame-retardant and environmentally friendly polyurethane materials, which can be used safely. High-Density material,which is higher than the industry standard of 30%. At the same time, it can also improve sound quality: by absorbing harmful sounds, reducing fluctuations, reverberation, and vibrating echo, Useful sounds are clearer. Low-Cost Noise Reduction & Efficient Soundproofing Sound-absorbing：The higher the density, the better the sound absorption of the acoustic foam. It can absorb high, medium and low audio, so as to achieve the noise, sound-absorbing effect. Wide Application: Suitable for sound recording studio, listening room, home theater, KTV, and all kinds of public places. EASY Easy to Install: Each high-quality, self-adhesive acoustic panel measures 12"x12"x1". A DIY 24-pack covers 24-square feet for acoustic treatment. Specifications: Material: Polyurethane Color: Black/Gray/Purple/Red/Yellow/Blue Function: Sound Absorption and Insulation Size: 30*30*2.5cm / 12*12*1 inch Thickness:2.5cm / 1 inch Package including: 6/12/24 Pack x Acoustic Foam NOTE: These foams are mostly used on the walls for sound absorption and noise reduction. They are not recommended to use on windows, doors or glasses. Their effect depends on the foam thickness and the density used, as well as the installation area. After the soundproof foam is compressed, the spring-back thickness will have an error of 0.1--0.3 in.