Deadening material excellent for soundproofing, insulation, and vibration control in cars and rooms. The uneven surface further enhances sound absorption. 【Size】 500mm x 1200mm x [Thickness/10mm] Purchased six months ago, and since I didn't use the whole roll, I'm selling it at a low price. This is a purchase from a thermal insulation material trading company, so it's a more robust material than products found online.