Easy to Install - soundproof wall panels comes with self-adhesive, tear off the double-sided tape on the back and use it immediately. Save your time and money. that press firmly after sticking to the wall to prevent falling off. Perfect for professional studios, video blogger,rehearsal rooms, concert , podcasting, school,home theaters, offices, pet kennels,etc. self-adhesive acoustic panels are lightweight and can be installed to a of different surfaces (walls,doors,windows,ceilings and so on) without any tools.The self-adhesive acoustic foam is also easy to cut to size, altering ' affect acoustic foam's performance. High quality Materials: sound absorbing foam panels crafted from fire-retardant and -Friendly material, it is safe to use in small and medium-sized rooms. High quality panels for better sound absorption, Reduce waves, reverb and flutter echoes in smaller to medium sized rooms. Installation : It is recommended to stick the tape to the four corners and the center of the back of the acoustic foam panels, and then to the wall. Or you can purchase spray glue to install the soundproofing foam according to your needs. color:Black + gray Material:Polyurethane Package Contents: 12 x Acoustic Foam Board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.