Mr. Gasket Multi-Layered Steel (MLS) Exhaust and Header Collector Gaskets are designed for extreme cylinder pressures produced by high horsepower-high compression engines. Manufactured from three stainless steel layers, these gaskets resists corrosion, will not burn or push out and will maintain torque retention. A stress formed inner and outer layer embossments act like a spring that rebounds under pressure, creating a force to seal excessive gap tolerances.