Sound-absorbing foam panels are made of flame-retardant and environmentally friendly materials that are safe to use. Our 1 inch foam provides moderate sound control on walls or ceilings. Ideal for individuals to reduce and absorb unwanted echoes, waves, reverb and echo flutter. Made of environmentally friendly polyurethane foam at 50/lbs per cubic meter, the acoustic panels not only have an effective soundAfter opening the vacuum package, soak them in water for 1-3 minutes, gently wring them out, and then place them in a ventilated area to air dry or use a blower to dry. Method 2. Place soundproof panels in a ventilated area for 24-72 hours. Suitable for professional studio, recording studio, voice studio, control room, rehearsal room, concert hall, podcast, etc., also can be used for church, home theater, professional theater, home studio, office, utility cabinet, etc. It can handle walls, ceilings, doors, etc. Color: BlackMaterial: PolyurethaneSize: 30x30x2.5cmPackage Contents:12 x Satellite Foam ChannelsOnly 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.