[Eco-friendly Material] soundproof foam panels are made of high-density polyurethane foam, fireproof and non-toxic. Professional sound-absorbing foam, safe to use. Keep in mind that white insulation foam will oxidize over time. [Wide Application] these foam absorbing studio widely used in home, office, recording studio, ceiling, movie theaters, game room, vocal stands, control room. Don't disturb each other! [Easy to install] can be installed on walls, ceiling, doors and windows. No tools required and no damage. You can reduce the size as you like, which will not affect its performance. [Excellent Performance-Absorbing Sound] for professional recording, YouTube videos and live game streams, these are the must-have products. Acoustic foam is used to eliminate reverberation and sound reflection, professional studio quality acoustic treatments, soften echo and outside noise, allows the audience can learn more clearly. Color: Gray Material: Polyurethane Size: 30x30x2.5cm Package Content: 24 * Sound-Absorbing Foam 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 error is +/- 1-3cm.