[- and Safety]Made of high quality environmentally polyurethane foam, these studio foam are durable and effective, no health risks, safe to .[Noise Absorbing]Our sound foam panels can dampen and diffuse mid to low frequency sound waves inside of a room, to minimize interference, increases increasing sound .[Easy to Install]These studio sound absorbing panels can be used as acoustic cover for walls, ceilings and doors, just easily attach it with , nails, screws, tacks or glue.[Widely Usage]Our sound dampening foam panels are great for recording studios, vocal booths, control rooms, also perfect theaters, professional theaters, concert and more.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 soak the foam in water for 1 minute, wring it dry, then dry or a blower drycolour: black + redMaterial: polyurethaneSize: 30x30x2.5cmPackage contents: 25 * black sound-absorbing cotton25 * Red sound-absorbing cottonWarm Tips:Foam will not deteriorate or apart over time, all you need to do is to clean the dust after long time . Only the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.