18mm Thick Car Sound Deadening Mat 20x31 inch Automotive Noise Insulation Sound Proofing Foam. Features strong sound absorption and sound insulation effect, reduces engine noise, tire squeal, road noise, wind noise, etc. Made of high quality PVC and NBR, with strong back glue that is not easy to fall off. Can be used in all parts of the car, including body panels, floors, under seats, and more.