Elemental Designs eDead 45 Sound Deadening - 20Sq. Ft. Self Adhesive - No 3rd Party Glues Required Easy Press On Installation - Great results are easy! High Temperature Glue Design - Canada or California the glue does not break down 45 Mil Thickness - Alumn Backing for Protection New Rubber Butyl Core - No Asphalt, No Melting Worries.