COUSTIC FOAM (polyurethane foam) to remove reverberation and sound reflections, provide sound insulation industrial and domestic applications suitable for sound studios. Unlike polyurethane foam, fiberglass and rock wool have health risks. The use of glass wool and rock wool require the use of protective gloves to prevent skin problems. ::: This product can be used as acoustic cover for walls, ceilings and doors and other various places such as theaters or movie theaters, recording studios, and other busy and crowded places such as gyms, subways, stations, offices, schools, and other areas. This product is great for voice and video recording, especially for Youtube.