Material : Rubber FoamPlacement : Car doorType : Soundproof CottonSignificant Sound Insulation - We are currently testing the insulation and from the test results, we know that the acoustic panels can effectively reduce noise and provide you with a comfortable environment. No matter how noisy your neighbors are, you can read some books in peace at home. Plus, you don't have to worry about disturbing people when gaming at high volume, as the Acoustic Panel will help you even more.Eliminates Echoes and Standing Waves - High-density material with its particle design effectively absorbs noise and cancels echoes. Whether you are watching TV at home, playing the piano in the piano room, or even dancing in the training room, the sound control panel will effectively reduce noise and provide you with the right environment to study and relax.Inflatable and Flame Retardant - Maybe some people are wondering if these acoustic panels are safe. In fact, you don't need to worry because it is made of eco-friendly materials, which are eco-friendly, healthy and eco-friendly. We specially use a lighter to flame the acoustic panel to ensure that the material is inflammatory and non-irritating odor, you can use it safely.Easy Installation - If you know about our acoustic foam before, you know how easy it is to install. Backed with chewing gum, it is lightweight and can be attached to a variety of surfaces. No special tools or materials are required for installation...the simple but essential design will reduce your workload.Widely Use - The sound proofing foam squares are a low cost solution to get better recordings at home or in the studio. That used for professional studios, rehearsal rooms, concert halls, podcasting, churches, home theaters, vocal booths, home,etc.Colour:blackMaterial:Polyurethane foamSize: 30 x 30 x 3.5cmPackage Contents:24 x Soundproofing Foam(Adhesive: random color,don't accept the specified color)Only the above package content, other products are not included.Note: Light shooting 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.