This is the nicest heat barrier we've found. Nice to work with, it's peel and stick with strong adhesive, and it's designed to be put anywhere. We use it on all of the Big Healey's we've done on the firewall and transmission tunnel. It's rated up to 1750F. It's made of 10 mil. aluminum with a woven mat insulator. Sized 48" x 21" and can be cut in pieces easily if needed.