HP Stealth Shield - Interior Heat Insulation by Heatshield Products HP Stealth Shield is designed to be used either underneath your vehicle carpeting or between your vehicle headliner and the roof to dissipate heat. At only 1/8" thick and easily trimmed to size with a razor knife, HP Stealth Shield installs easily and hides beneath the surface. With a rating of up to 1800 degrees F of continuous heat, the HP Stealth Shield will easily dissipate any heat situation you encounter in day to day driving or racing. The part number for this item is 810001 and it measures 24" x 53". It can easily be cut to size with a razor knife.