Unique Design of Wedge SurfaceThis Acoustic Foam Panels is designed as unique triangle, which can not only absorb unnecessary sound, but also play a role in decorating the wall surface. Performs good in absorbing and eliminating unwanted echoes, flutter echoes, standing waves, reverb. You can harness to create the optimal environment for music recording or peaceful work. Easy to ExpandHigh density (25kg/cbm)polyurethane foam material are adopted for our sound panels, so they have extremely high resilience. Most of cases they can expand to full size and shape immediately even they are compressed sealed in package for a long time, sometimes it may take longer, a few hours to 1-3 days. Flame Retardant MaterialOur acoustic foam panels are designed with professional-grade open cell polyurethane foam, passed the environmental protection and flame retardancy test of SGS, for safe and comfortable use. Widely UsageGUERRI Acoistic soundproofing foam wedges can be use