Package of 12 covers 12 square feet - Each tile is 1 square foot of acoustic corner 1 inch thick. Foam is consistent in density and firmness, so sound absorption will also be consistent. Reduces unwanted noise and echoes - Panels help reduce reverberation, flutter echoes, acoustic reflections, remove unwanted noise, and are best suited for small to medium-sized rooms, theater halls, recording studios, churches, or offices. Achieve higher quality audio and video recordings - Instantly improve your audio quality by reducing background noise and echo while recording voiceovers, music, interviews, podcasts, or YouTube videos. Easy to install: Acoustic foam panels are lightweight and can be installed on a variety of surfaces. No special tools are required for installation. Please note: Double-sided tape/tape or adhesive is not included in the package and must be purchased separately. Use it to treat a professional or home recording studio, office advertising or home, rehearsal room, or home theater. Easy to shape and cut, modification does not affect performance. How much space does a tile cover? An acoustic panel studio foam wedges 1" x 12" x 12" are 1" thick and cover 1 square foot. If you buy a set of 12 of 1" x 12" x 12", this would cover 12 square feet. The foam will not degrade or collapse over time. It is enough to dust for long periods. Warning This product comes in compressed form. The product has resilience. After receiving the package, it may bounce back after unpacking. Causes such as low temperature or not unpacking for a long time will affect the return.