Mr. Gasket Intake Gasket is manufactured from a blend of nitrile rubber and fiber for excellent sealing and durability. Intake gaskets are precision die-cut for each specific application to ensure a great fit. Intake gaskets are tailored to match the intake ports on intake manifolds and cylinder heads. 0.625" thick. Gaskets are used to prevent fluid or gas leaks by providing a barrier between two mating surfaces. This intake gasket can be easily cut to match most modified cylinder head and intake ports if necessary. The set comes complete with all necessary seals and block-off plates.