Mr. Gasket® Ultra-Seal® valve cover gaskets are made from high-density cork and rubber material with a steel core. The steel core prevents drawing or pushing of the gasket inside or outside the engine at high RPMs. These gaskets are non-shrinking and non-sticking and made for excellent sealing and durability (can be reused). Gasket’s thickness provides for additional clearance between valve train and valve cover. Sold in pairs.