Helix High Temperature Exhaust Wrap Made from crushed volcanic Basalt rock, Helix Hi Temp Exhaust Wrap will keep the heat where it belongs - up to 2500F. Features: Available in 1 or 2 width All widths sold in 25 foot lengths Made from crushed volcanic Basalt Temperature rating of 1800F continuous/2500F intermittent Stronger than standard fiberglass Natural glossy bronze color Made in the U.s.a.