Universal Turbo Blanket Heat Shield Turbocharger Cover for T3 T28 GT25 GT30 Inner surface shielded with calcium magnesium silicate wool 1 inch ceramic insulation that can Hold Up to 2000F !! Inner top layer is made of stainelss steel knitted wire mesh compressor and exhaust housing Made of Hight Quality Silicone impregnated fiber glass material with stainless steel capstan rivets