exhaust protection- what do they call the flexible metal shield?

Hi WD - exhaust protection- what do they call the flexible metal (skinny) shield, usually silver in color, perforated, that can be bent around the headers?

Customer is looking for some, and since I already supply the heat shields for the WIDER part of the exhaust (both Giant Loop as well as A.T.G.), would like to stock the 'skinny' stuff, too!

thanks  :thumleft:
Chris