Frost King Fiberglass Utility Rollos, 16"x1"x48" Cut to size fiberglass Noise reduction or cushioning Use on car hoods, in walls, for water pipes, heaters and heating and cooling ducts Frost King. Fiberglass. Handy Utility Roll Constructed From Safe Fiberglass Product Is Both Fire Retardant, And Heat Absorbent This Is To Be Used On Heating, And Cooling Pipes, Ducts, Auto Hoods, And Trucks Measurements Are 16-Inch X 3/4-Inch X 48-Inch