How To Restore The Acoustic Foam To Its Normal Size: 1. After opening the vacuum package, place the acoustic foam in a well-ventilated area for 12–24 hours; 2. Alternatively, soak the foam in water for 1 minute, gently wring out excess water, then allow it to air dry or use a blower to dry. High-Quality Materials: Our sound-absorbing foam panels are made from fire-retardant polyurethane material, safe for use in small to medium-sized rooms. These high-quality panels help reduce sound waves, reverb, and flutter echoes, improving overall sound absorption. The sound absorption principle of the acoustic foam involves sound waves being repeatedly reflected within the foam structure, which helps reduce noise. The acoustic panels offer effective sound absorption and are non-toxic and safe for indoor use. The material maintains its sound-dampening properties over time. For cleaning, simply vacuum or dust the panels as needed. Installation: It is recommended to apply adhesive tape to the four corners and center of the back of each panel before attaching them to the wall. Alternatively, you may use spray adhesive based on your installation preference. Wide Application: These acoustic foam panels provide an affordable solution for improving sound quality in various environments such as recording studios, rehearsal rooms, home theaters, podcasting setups, vocal booths, and more. Color: Black + White Material: Polyurethane Size: 30 x 30 x 2.5 cm Package Contents: 6 x Black Sound-Absorbing Foam Panels 6 x White Sound-Absorbing Foam Panels Note: Lighting and display settings may cause slight variations in color between the image and the actual item. Measurement may vary by ±1–3 cm.