Cometic’s 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 205F. Have an 85% shape-recovering while maintaining strong torque retention – ideal gasket material for machined surfaces. Does not require gasket sealer. Primary gasket kit includes 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..