[Self-adhesive] The sound-proof foam panel has a self-adhesive label that covers the entire back and can be attached to any surface. No tools or materials are required for installation. Easy to shape and cut, modification will not affect performance. [Professional sound-absorbing performance] Sound insulation foam panels are installed to reduce noise pollution. They can effectively reduce reverberation, floating , undesirable acoustic reflections and unnecessary noise. The sound insulation foam panel is used to control the reverberation sound, which is completely different from the sound insulation effect. It can eliminate in the room, improve sound quality and stereo imaging. [Easy to install] During transportation, compress the sound-proof foam under vacuum and place it in a well-ventilated place for about 24-72 hours to quickly return to normal size. If some sound insulation foams do not , you only need to dry in water and they will expand completely ( to ventilate and dry 24-4 8 hours installation, and then the water will not harm the adhesive). [High-density -retardant] This soundproof wall panel is made of high-density polyurethane foam, 50/lb per yard. The thickness is 2 inches (about 5 cm), which is 25% higher than similar products in density. It can moderate sound control or ceiling. Through professional noise reduction and noise reduction, the sound control panel can noises well, and useful sounds are clearer. The sound insulation foam is -retardant and prevents the spread of fire. [Various uses] acoustic foam panels are suitable for sound processing in occasions. It is very suitable for sound processing on the walls of recording studios or offices, recording studios, control rooms, office home studios, home offices, home entertainment theaters, conference rooms. adhesive: random color, 't accept the specified color colour: gray Material: polyurethane Size: 30x30x5cm Package Contents: 24 x Acoustic Foam Panels 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.