Exhaust gasket is made of .030 Multi Layer Steel material which can withstand extreme temperatures and maintains a torque set. Gasket features 2.250 Round Port. Cometic MLS (Multi - Layer Steel) Exhaust Gaskets are designed for extreme cylinder pressures. MLS Exhaust Manifold Gaskets maintain a torque set and resist corrosion. They will not burn through or push out. MLS Exhaust Manifold Gaskets withstand different combinations of cylinder head and exhaust manifold materials. No sealants are required.