Professional Sound Absorbers: Acoustic foam is installed to reduce noise pollution, as they remove echo and background noise by not blocking sound but absorbing it. Sound absorbers are used to control reverberation sound, and this is very different from sound insulation. Recovery may take some time due to the high density and compressed packaging. If some of them cannot recover within 24 to 48 hours after opening, soak them in water, squeeze out the water, and let them dry, the sound absorber will recover quickly. More Comfort/Less Stress Acoustic Foam: The most common problem in rooms with high ceilings is . A creates multiple wavelengths of reverberant sound waves that interfere with conversations in the room. Sound absorbers absorb unwanted sounds like echo and ambient noise, making other sounds clearer. Quick Installation Soundproofing: Equipped with self-adhesive material, our pyramid foam is and can be installed on a variety of surfaces (walls, doors, windows, ceilings, etc.). The self-adhesive acoustic foam is also easy to cut, modifications do not affect the performance of the foam board. Color: Black Material: Polyurethane Package Contents: 12 x Studio Foam Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.