25% stronger than fiberglass wrap, JEGS woven Lava Wrap™ is made from crushed volcanic rock! Designed to reduce underhood temperatures outside as much as 50% while maintaining hotter exhaust gas inside for more horsepower. Withstands exposure up to 1200°F direct/continuous and 2000°F intermittent. Safe for exhaust tubing, headers, mufflers, and catalytic converters (not for use on a turbo). Cable ties or hose clamps required for retention. .