The contact area between the acoustic foam and sound wave is increased, which can effectively reduce flutter echo, reverberation, standing wave and high-frequency noise. The main functions of these sound foam are noise reduction, sound absorption, echo reduction, home studio improvement, music recording and effective acoustic treatment. these sound proof foam panels are made of non-toxic materials, do not emit any gases and are safe to breathe and touch. just need to open the package and wait compatible with24h-48h to recovery, clean and dry the surface, tear off the backing paper and install, press firmly. Our self-adhesive sound dampening panels can be installed on a variety of surfaces (walls, doors, windows, ceilings etc) without any tools and are also easy to cut to size. (If you need to remove the sound absorbing foam, heat them with a hair dryer. If you need to clean them, use a vacuum cleaner or a damp cloth). sound proof panels compatible withwalls are good choice compatible withhomeowners, podcasters, musicians, renters and gamers compatible withwalls, houses, apartments, bedrooms, home theaters, recording studios, control rooms, offices, home studios, music rooms, gaming areas, closet drum rooms, acoustic studios, recording booths and other places where sound insulation is needed. Keep unwanted noise to a minimum with our sound deadening foam. With adhesive backing, adhesive color is random, Not accepting designation color: Black Material: polyurethane Package Contents: 6 x Acoustic 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.