Spectre's 2 1/2 inch - 2 1/4 inch Reducers include an extra thick 1/8 inch gasket. This reducer features nickel-plated steel and the gasket is made from compressed ceramic fiber (CCF), which far exceeds typical non-asbestos type gaskets. CCF will not deteriorate or crack from excessive heat or pressure. Nuts and bolts are included ensuring optimum fit and function.