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 2500 F. Have an 85% shape-recovering while maintaining strong torque retention – ideal gasket material for machined surfaces. Does not require gasket sealer. Kits include all gaskets, seals, and o-rings required for both the inner and outer primary. Made in the U.S.A..