The acoustic foam panels are made of professional-grade high-density polyurethane foam material. The 3D design increases the contact area between the sound-absorbing panel and the sound wave, which can effectively reduce flutter , reverberation, standing wave, and high-frequency noise. Improve sound quality and clarity, bring you a quiet and comfortable environment. Sound absorbing panel soundproof panels are made of new sound-absorbing material that is non-, harmless, and pollution-free, and there be no danger in long-term use. The inside of the sponge is made of a mixture of combustion-supporting materials, which has strong fire resistance and good air permeability and can be extinguished immediately when the fire is turned off, preventing fire hazards. The acoustic wall panels are used to reduce the noise level in environments. The main applications include audio and video test rooms, recording studios, music rooms, home theaters, home offices, conference rooms, concert , classrooms, KTV rooms, hotels, live game rooms, washing machine rooms, home decor, and other places requiring high audio processing. The soundproofing panels for walls are made of ultra-high resilience sponge polymer material, which instantly suppresses dozens of high-temperature new technologies. After opening the package, foam squares expand quickly to their full shape and size. Usually, the dilation time does not exceed 24 hours. No special tools are required for installation. Adhesive: Random color, don't accept the specified color Colour:black Material:polyurethane Size:One side length: about 17.5cm Package Contents: 12 x Acoustic Foam Panels Only the above package content, other products are not included. Note: Light reflection 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.