TC Bros. Black Fiberglass Exhaust Header Wrap. 2 inch wide 1/16 inch thick 50 foot roll. 50ft is usually enough for most twin cylinder motorcycle exhausts, we recommend 50ft for dual pipes such as Yamaha XS650 exhausts. Wrapping the exhaust system maintains hotter exhaust gases, decreasing the density, and allowing the exhaust gas to exit the system faster! By doing this, the engine breathes more efficiently, thus allowing the engine to develop more power! Rated for tempatures of 1000 degrees farenheit continuous, 2000 degrees farenheit intermittent. Use safety wire, stainless zip ties, or hose clamps at the ends of the wrap to secure it.