[Safe and Eco-Friendly]Soundproof panels for walls made of high quality environmentally polyurethane foam,formaldehyde-free, which have an great advantage of reducing and absorbing noise. These studio foam are and effective, no health risks, safe to use. [Quick Recovery]1. After opening the Vacuum package, place the Acoustic Foam in a ventilated place for 12-24 hours; 2. Or soak the foam in water for 1 minute, wring it dry, then air dry or use a blower dry. [Easy to Install]Sound dampening panels are and can be installed to a variety of different surfaces. no tools or materials are required for installation! The Soundproof Wall Panels with glue on the back,Just peel off the protective film and to the walls ,door and ceilings. [2.5cm Thick]You may be concerned that the thickness of the acoustic panel will affect its sound absorption. In fact, the effect of acoustic foam does not necessarily depend on its thickness. Although only 1 inch, our acoustic panels are composed of high-density materials. They effectively remove echoes and remove static and flutter. [Wide Applications]Excellent acoustic treatment for many occasions, noise acoustic sound panels can not only reduce and absorb unwanted echoes, waves, reverberations and tremor echoes to make other sounds clearer, but also can be used as wall decoration.Easy to shape and cut to any size, altering ' affect performance. Colour:black Material:Polyurethane Size:30 x 30 x 2.5cm Package Contents: 24 * Soundproofing Foam(The color of the adhesive is random, and the designation is not accepted) 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.