Design Engineering 050501 Floor & Tunnel Shield II - Heat and Sound Insulation, 21" x 24" (3.5 sq. ft.) Blocks radiant heat from entering driver compartment; ideal for firewalls, under-vehicle, floor pans, oil tank box areas, transmission tunnels, wrapping fuel cells, under hoods & more Withstands direct high heat temperatures up to 1750 degrees Fahrenheit Serves as a barrier to unwanted road, tire, & engine noise Aggressive self-adhesive backing holds past 450 degrees Fahrenheit; Easy to form to shapes and contours Constructed from 10 mil aluminum bonded to finely woven layer of high temperature resistant glass fiber