10mm (3/8") Thick Material, Provide Better Sound Heat Insulation] Our automotive sound deadener is composed of three layers of high quality material including aluminum foil, thickened 10mm foam, high quality back glue. It provides better noise insulation effect for your car so you can enjoy a more quiet and comfortable environment, at the same time effectively reduce 98% heat transfer. 10mm thickness is suitable for the hood, firewall, floor providing better insulation. High-quality Material, Meet the Needs of Longer And Better Use] 10mm thickened foam has higher anti-extrusion function compared with inferior foam product, so there is no need to worry about the collapse of the use process. Excellent adhesive has strong viscosity, which can ensure to stick firmly. High quality back paper is easy to to peel install and not easy to tear. Cut Sheet Packaging, Ensure Product Quality Convenient Install] Products include: 20 inch X 12 inch sound deadener. 27 pieces, total cover areas are 43.4 sq. ft. You will receive 27 pieces of 12 inch X 20 inch (43.4 sqft.) self adhesive, foil backed foam insulation. Sold with free shipping.