Platinum gaskets and seals are all precision engineered and made from high quality materials. Head Gaskets: All are manufactured in high grade graphite materials with stainless steel bore bindings or MLS (Multi Layered Steel), whichever is applicable to each particular engine. This combination of superior MLS technology along with precision engineering, are the ideal solution for high pressure applications. Rocker Cover Gaskets: Manufactured in silicon material, these gaskets provide mechanical stability over a broad temperature range to ensure sealing integrity. Engine Oil Seals: All genuine NOK seals. Valve stem seals: Made from Viton, providing an excellent durability and a quality resistance against seal failure.