Finally! An exhaust gasket that really works! 100% graphite construction means Remflex gaskets can take the heat-up to 3,000º F!A built-in 50% crush allows Remflex gaskets to fill gaps in headers or exhaust manifolds up to 1/16-inch inch. No more leaks…ever! Remflex gaskets are designed to rebound against the sealing surfaces, so they never require re-tightening! 100% satisfaction guaranteed! If, for any reason you aren't satisfied with Remflex exhaust gaskets, return them within six months of purchase, along with proof of purchase and receipt, and we'll either replace them or give you your money back! That's the Remflex Performance Promise.