【SPECIFICATION】: Size - 12 x 12 x 0.3 Inches, pack of 20; Coverage - 20 square feet; Weight - 0.19 lbs per panel. Density: 7.8lb/ft3. Material: 100% Polyester Fiber,【OUTSTANDING ACOUSTIC PERFORMANCE】 - The studio panels are made of high quality polyester fiber; Great at reducing room reverb, echoes, standing waves, and noise; NRC(noise reduction coefficient): 0.7. Average absorption coefficient: 0.75,【MULTIPURPOSE】: These sound absorbers are ideal for sound treatment and decoration on ceiling and wall; Perfect for home theater, vocal booth, podcast, voice overs, recording studio, youtuber and more,【ECO-FRIENDLY】: Odorless, non-toxic, formaldehyde-free, corrosion resistant, anti aging, safe for indoor use,【EASY TO CUT/ INSTALL & MINIMAL WALL DAMAGE】: Our acoustical sound panels are easy to cut with a knife and install. You can quickly set up these boards on walls/ceilings using construction adhesive, TroyStudio double-sided tape (search B0D49BBSCB, sold separately), or small screws. Compared to self-adhesive panels, installation using an external adhesive causes minimal damage to your walls upon removal