Mr. Gasket Ultra Seal Silicone Beaded Gasket is perfect for aluminum heads and manifolds. It is made from a blend of cellulose and nitrile material which is less compressible. The height of this gasket is 2.11" and its width is 1.25". This composition enhances excellent sealing and durability. Silicone beading is applied around each intake port to generate a tight leak-proof seal. The thickness of this gasket is 0.060". The ultra-seal intake gasket provides the perfect solution for intake-sealing problems associated with the small sealing areas between ports and the different expansion rates of intake manifolds and cylinder heads. This intake gaskets can be trimmed to fit modified ports.