sound proof foam panels for walls are made of polyurethane foam and adopt a distinct pyramid 3D design. The contact area between the acoustic foam and sound wave is increased, which can effectively reduce flutter , reverberation, standing wave and high-frequency noise. The main functions of these sound foam are noise reduction, sound absorption, reduction, home studio improvement, music recording and effective acoustic treatment. soundproof wall panels self-adhesive, flame retardant, eco-friendly, odorless and non-. acoustic foam panels can eliminate echoes and effectively eliminate standing waves and flutter. Meanwhile, these acoustic panels are made of non- materials, do not emit any gases and are safe to breathe and touch. [Easy to Install, Just 4 Steps] You just need to open the package and wait for 24h-48h to recovery, clean and dry the , tear off the backing paper and install, press firmly. Our self-adhesive sound proof foam panels can be installed on a of surfaces (walls, doors, windows, ceilings etc) without any tools and are also easy to cut to size. (If you need to remove the soundproof foam panels, heat them with a hair dryer. If you need to clean them, use a vacuum cleaner or a damp cloth). [Wide Application for Your Sound Need] Our soundproof wall panels are good choice for homeowners, podcasters, musicians, renters and gamers for walls, 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, the color of the adhesive backing is random and cannot be specified. Colour:Black Material:polyurethane Size:About 30x30x5cm Package Contents: 6 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.