Cometic proprietary AFM (Aluminum Foamette Material) gaskets feature an aluminum core with a chemically blown, compounded nitrile synthetic rubber bonded to the outside Gaskets have resistance to temperatures of more than 2500F Have an 85% shape-recovering while maintaining strong torque retention - ideal gasket material for machined surfaces Does not require gasket sealer Primary gasket kits include all gaskets, seals, O-rings and lock tab washers required for both the inner and outer primary Primary oil change kits include derby cover gasket and O-rings to properly change primary lubricant once Made in the U.S.A.