WOWMAt 100 Sq Ft x 50 mil Thick Self-Adhesive Mat Sound Deadener Bulk Pack Deadening CDL Mat Sheets Automotive Insulation Rattle and Noise Control Vibration 100-Sheets 12"by12" Peal And Stick Application Asphault Bases Material Sound Deadening Acoustical Insulation for automotive, trucks, homes, RV's, and marine Absorbs vibrations and noises, enhances audio clarity. Use on automotive doors, floors, and trunk floor.