acoustic foam panels are made of highly resilient material that returns to its shape even after being compressed and packed for an extended period. Acoustic panels sound absorbing quickly recover in just 3-5 hours of dispersal and ventilation. PLEASE NOTE: If it does not regain its shape, soak the Noise Reduction Wall Panels in water for one minute, then wring out the water and dry at low temperature or air dry/sun dry. foam panels are better suited for large areas of the studio and are non- and odor free to affect your work. sound absorbing panel is made with flexible, professional grade acoustic foam, and can be easily attached to a variety of surfaces. It is not only suitable for recording studios, rehearsal room, home theater, vocal studio, game room, control room and other places, but can also be installed on walls, doors, ceilings, etc. size: 30 x 30 x 2.5cm Material: polyurethane colour: Black Package Contents: 52 x soundproofing panels 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.