[Easy To Install]acoustic foam can be recovered to normal size in half an hour, doesn't need to wait for 2-3 days, quick-recovery than others. KINDLY NOTE: Clean the wall to make the wall flatter before you install the noise cancelling foam, you can use adhesive , push pins, strong double-sided tape, or strips (not included) to install the foam. [Better Acoustical Treatment]The triangular grooves structure of soundproofing foam is better for noise absorption. These soundproof wall panels are suited to placing on sonically reflective surfaces to act as sound absorbers, help to reduce echoes, background noise, standing waves reverberation time, and improve sound quality. [Extensive Application]These acoustic foam panels are suitable for acoustical treatment. Use ly in recording studios, offices, home theaters, rehearsal rooms, basements, and so on. [Eco-friendly Material]These acoustic panels sound absorbing are made of high-density polyurethane material. with strong fire resistance and good air permeability, no smell, and safe for use in different areas. Colour:black Material:Polyurethane Size:12inch x 12inch x 1inch Package Contents: 24 x Sound insulation Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.