1. Restoring the Acoustic Foam to its Normal Size: After opening the vacuum pack, place the acoustic foam in a ventilated area for 12-24 hours. Alternatively, soak the foam in water for 1 minute, wring it out, and let it air dry or use a hairdryer. 2. The principle of acoustic foam is that the sound inside the sponge is repeatedly reflected back and forth, achieving the effect of noise reduction and sound absorption. The sound panels not only have effective sound-absorbing properties but also cause no harm to the body. High-quality studio foam material can permanently maintain sound insulation properties. For cleaning, simply vacuum and dust occasionally. 3. High-Density Fire-Retardant Material: Sound-absorbing foam panels are made of fire-retardant and environmentally friendly materials, making them safe to use. The absorption spectrum is broad and exceeds 500 Hz. High-density material, which is higher than the industry standard of 30%. At the same time, it can also improve sound quality: by absorbing harmful sounds, reducing fluctuations, reverberation, and vibration, useful sounds become clearer. 4. Installation: It is recommended that you attach tape to the four corners and the center of the back of the sound insulation panels and then to the wall. Alternatively, you can purchase spray adhesive to install the acoustic foam according to your needs. 5. For Professional Acoustic Control: Each acoustic foam is delivered uncompressed and in good condition. With professional acoustic control, sound dampening, acoustic processing, noise reduction, the acoustic foam is designed to reduce waves, reverberation, and flutter in small and medium-sized rooms. Sound panels are suitable for sound recording studios. Color: Black Material: Polyurethane Size: 30 x 30 x 2.5 cm Package Contents: 60 x Acoustic 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 to be slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.