Asphalt-based 1/16" thick black sheeting trims easily to conform to panel contours. Reduces resonant vibration and sound distortion in body panels around speaker installations. Effectively decreases loudness and duration of road, engine sounds. Self-stick backing adheres instantly to body panel, floor pan, firewall—any sheet metal. Covering as little as 10% of a sheet metal panel can significantly dampen sound. Instructions included. 2 sizes: 32" x 54"; 10" x 13", ideal in tight areas (around speakers or power window motors in door or rear side panels).