[-friendly and Safety]Made of high quality environmentally polyurethane foam, these studio foam are durable and effective, no health risks, safe to use.<br> [Noise Absorbing] sound foam panels can dampen and diffuse mid to low frequency sound waves inside of a room, to minimize interference, increases increasing sound .<br> [Easy to Install]These studio sound absorbing panels can be used as acoustic cover for walls, ceilings and doors, just easily attach it with , , screws, tacks or glue.<br> [Widely Usage] sound dampening foam panels are great for recording studios, vocal booths, control rooms, also perfect theaters, professional theaters, concert and more.<br> How To The Normal Size Of The Acoustic Foam: 1. After opening the Vacuum package, place the Acoustic Foam in a ventilated place for 12-24 hours; 2. Or the foam in water for 1 , wring it dry, then air dry or use a dry<br> colour: black + red<br> Material: polyurethane<br> Size: 30x30x2.5cm<br> Package contents:<br> 25 * black sound-absorbing cotton<br> 25 * Red sound-absorbing cotton<br> Warm Tips:<br> Foam will not deteriorate or apart over time, all that you need to do is to clean the dust after long time use.<br> Only the above package content, other are not included.<br> 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.