Elemental Designs eDead 80 Sound Deadening - 40Sq. Ft. New Rubber Butyl Core - No Asphalt, No Melting Worries. Easy Press On Installation - Great results are easy! High Temperature Glue Design - Canada or California the glue does not break down 80 Mil Thickness - Hybrid Backing for Protection - Self Adhesive Twice the thickness standard mat products & eDead 45