[Self-Adhesive] The sound-proof foam panel has a self-adhesive tab covering the entire back that can easily stick to any . No special tools or materials are needed for installation. Easy to shape and cut to size, altering 't affect performance. [Professional Sound Absorbing Properties] Acoustic foam panels are installed to reduce noise pollution.They effectively reduce reverb, flutter echoes, undesirable acoustic reflections, unwanted noises. Acoustic foam panels are used to control the reverberation sounds make and this is quite different from soundproofing. it can the in the room, improve the sound quality and stereo imaging. [Easy to Install]The sound-proof foam are compressed under vacuum during portation and quickly recover to normal size by placing in a well ventilated place for about 24-72 hours.If some acoustic foams have not been restored, You only need to dry them in water, and they expand completely, (remember ventilate to dry for 24-48 hours before install, then water not hurt the adhesive). [High-Density Flame-Retardant Material]The soundproof wall panels made up of High-density polyurethane foam at 50/lbs per cubic yard. 2 inches thick, 25% more dense than competing products. It can provide moderate sound control on walls or ceilings. With professional sound suppression and noise reduction, the acoustic panel can well absorb the undesirable noise, Useful sounds are clearer.The sound-proof foam is fire retardant, stop fire from spreading. Keep you safe. [Wide Use] Our Acoustic Foam Panels is suitable for sound processing in occasions. Great for spot treating sound on walls in your studio or office, Recording Studios, Control Rooms, Offices Home Studios, Home Offices, Home Entertainment Theaters, conference rooms. Colour:gray Material:Polyurethane Size:30 x 30 x 5cm Package Contents: 12 * Acoustic Foam Panels(With adhesive, the color of the adhesive is random, and the spec