Athena offers the most complete range of gaskets and gasket sets for every make and model of motorcycle, jet-ski, snow-mobile and outboard in the world. The quality of Athena's gaskets replaces and exceeds the seal offered by the original products. Athena's extensive experience gained in supplying most prestigious O.E.M. motorcycle manufacturers has brought to their R&D technicians the skills necessary to make their exclusive high-quality material compounds. Replacement top end gasket kit for the Athena Big Bore kit. Manufactured in "State-of-the-Art" computer-controlled facilities. All gaskets made from the highest quality materials. Head gaskets feature rubber-coated spring steel construction. Soft steel base gaskets are rubber coated. Steel core materials feature high spring-back and superior tensile strength.