[High quality materials] Our soundproofing foam panels made from fireproof and ecological materials, it is sure to use in small and medium -sized rooms. High quality panels for better sound absorption. Reduces waves, reverberation and flutter echoes in small to medium size rooms. [Noise absorption] for professional acoustic absorption and reduction in reverberation. This sound foam by attenuating excess sound waves to obtain better recording effects, the surface of the egg crest increases the contact zone with sound waves, and the acoustic absorption effect is better than Other forms of surfaces to minimize interference, increases the clarity of the sound. [How to recover the normal size of the acoustic foam] 1. After opening the vacuum packaging, place the acoustic foam in a ventilated place for 12 at 24 o'clock; 2. Or soak the foam in the water for 1 minute, wipe it, then dry it in the open air or use a dry blower. [Installation method] It is recommended to stick the tape At the four corners and in the center of the back of the acoustic foam panels, then stick it to the wall. Or you can buy spray glue to install soundproofing foam according to your needs. [widely used] It is widely used for the treatment of stains in professional concert halls, recording studios, Homemade cinemas, offices or rehearsal spaces, etc. You can install our sound acoustic panels on your ceilings, walls or doors. It is easy to shape and cut to the waist. The changes do not affect performance. Size: 30x30x3.5cm Material: Polyurethane foam Color: Black Contents of the packaging: 24 x soundproofing foam Only the contents of the above packaging, the other products are not included. Note: light shooting and different display can make the color of the article in the slightly different image of The real thing. The authorized measurement error is +/- 1-3cm.