HIGH DENSITY AND ECO-FRIENDLY - Made from 100% polyester fiber, 150kg/m3, better Sound Insulation than soundproofing foam! Sound proofing and flame retardant, odorless, non-toxic, non-slip, corrosion resistant, and anti-aging,SIZE - 12" X 12" X 0.4", light weight, multiple colors for decoration; Package includes - 12 Pack Set Acoustic Absorption Panel,MULTIPURPOSE - Perfect for individuals to reduce and absorb unwanted echoes, waves, reverb and flutter echoes and wall decoration. Use to spot treat a professional or home recording studio, commercial or home office, rehearsal space, or home theatre. Easy to shape and cut to size, altering won’t affect performance,EASY TO INSTALL - Soundproof wall panels are easy to handle with glue or double-sided tape. You can use our soundproof panel in your room, recording studio and KTV,WIDE APPLICATIONS - Acoustic Panels can be used in recording studios, offices, rehearsal rooms, concert halls, home theaters and other places where sound needs to be handled, are easy to shape and cut to size, and variations will not affect performance