[Self-adhesive] The third-generation sound insulation foam panel is very easy to install, and the entire back has glue, which is convenient for fixing on walls and ceilings. Installation requires no additional tools or materials. Tear off the tissue paper and paste [Better Sound Absorption] The thicker the foam, the better the sound absorption. Our acoustic foam panels are 2 inches (-5.1cm) and 1inch(-2.5cm) thicker than 1inch(-2.5cm), a 35% increase in effectiveness. When you play guitar or piano, you don' have to worry about disturbing others.[DIY Cutting Decoration] You can cut any size you want with scissors, the change will not affect the performance. You can your favorite decorative pattern with studio foam in a variety of colors.[Eco-friendly and fireproof] Our soundproofing pads are made of eco-friendly polyurethane foam, they are professional grade non-toxic and odorless foam. In addition, we add flame retardant formula to the sponge to reduce sudden danger and ensure safety.[WIDELY USED] Widely used in recording studios, home theaters, vocal booths, conference rooms and control rooms. The larger the area of sound insulation foam, the better the noise reduction effect. 12 packs cover 1.12 square meters, each tile is 2inch thick with 2inch thick acoustic wedges.Colour:black+redMaterial:PolyurethaneSize: 30 x 30 x 5cmPackage Contents:6 x Black sound-absorbing cotton6 x Red sound-absorbing cottonNote: With adhesive, adhesive: random color, don' accept the specified colorOnly 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.