[Self-adhesive] The third-generation sound-proof foam panel is very easy to install, and there is adhesive paper on the entire back, which is convenient for fixing and ceiling. No additional tools or materials are required for installation. Tear off the thin paper and paste it. Installation is very simple! [2 inches (approximately 5.1 cm), better sound absorption] 3D acoustically designed sound-proof foam helps to break the sound waves, which is very suitable for individuals to reduce and absorb unnecessary , fluctuation and reverberation, and increase sound clarity. The foam is thicker, and the sound absorption effect is better. When playing guitar or piano, you don't need to worry about disturbing others. [Easy to cut] You can use scissors to cut any size you want, and the change will not affect the performance. You can use a of colors of acoustic foam to splice your favorite decorative patterns. Make your room more interesting. Therefore, the sound insulation foam board is very suitable for wall decoration. Say goodbye to the old wall! [Environmental protection, fire resistance] Sound insulation foam is made of environmentally friendly polyurethane foam material, using professional grade non- and odorless foam. In addition, we add flame retardant formula to the sponge to reduce sudden danger and safety, so you can install it at any time. [Applicable to different scenes] Widely used in recording studios, home theaters, vocal kiosks, conference rooms and control rooms. And it can easily cover a large area, because 12 packs cover an area of 4 square feet, each tile is a 2-inch thick acoustic slope, and the area of sound insulation foam is larger, and the noise reduction effect is better. Colour: black + red Material: polyurethane Size: 30x30x5cm Package Contents: 6 * Blacksoundproof cotton 6 * Red soundproof cotton 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.