How to restore the acoustic foam to its normal size: 1. After opening the vacuum packaging, place the acoustic foam on a ventilated area for 12-24 hours; 2. Alternatively, dampen the foam in water for 1 minute, twist it out, air dry it or use a hair dryer. High-quality materials: Our sound-absorbing foam panels are made from fire-retardant and eco-friendly materials, making them safe for use in small and medium-sized rooms. High-quality panels for better sound absorption, reducing echoes, reverberation, and flutter in smaller to medium-sized rooms. The principle of soundproofing foam is that sound inside the foam is reflected repeatedly back and forth, achieving the effect of noise reduction and sound absorption. The acoustic panels not only have efficient sound-absorbing properties but also won't harm our bodies. The high-quality material in studio foam can maintain its soundproofing properties permanently. When it comes to cleaning, you only need to vacuum and dust dry them occasionally. Installation method: It is recommended to attach the tape to the four corners and center of the backside of the acoustic foam panels and then secure them to the wall. Alternatively, you can purchase spray adhesive to install the soundproofing foam according to your needs. Broad application: Soundproofing foam squares are an affordable solution for achieving better recordings at home or in a studio. They are used in professional studios, practice rooms, concerts, podcast recordings, churches, home theaters, and stages. Color: black + white Material: polyurethane Size: 30 x 30 x 2.5 cm Packaging content: 6 x black sound-absorbing cotton 6 x white sound-absorbing cotton Only the above packaging content is included; other products are not part of the package. Note: Light reflection and different screens may cause the color of the object in the image to slightly differ from the actual product. The allowable measurement error is +/- 1-3 cm.