Usage Tips:[Eco-friendly Material]Sound proof foam panels are made of environmentally high density polyurethane foam, fire retardant and non-toxic. Professional sound-absorbing foam, safe to use. Please note that the white insulation foam will oxidize over time. [Widely Usage ]These studio absorbing foam widely use for home, office, recording studio, ceiling, movie theaters, gaming room, vocal booths, control room. No disturbing from each other [Easy to Install ]It can be installed on walls, ceiling, doors and window. No tools required and no damage. You can cut the size as you wish, which will not affect its performance. [Perfect Sound Absorbing Performance] For professional recording, videos, and game live streams, these are essential products. Acoustic foam is used to eliminate reverberation and sound reflection, professional studio grade acoustical treatments, attenuate the and outside noise, allows the audience can hear more clearly. Colour: gray Material: polyurethane Size: 30x30x2.5cm Package Contents: 24 * Soundproofing foam Only the above package content, other products are not included. Note: Light 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.