Spectre's Header-Collector Reducer kit includes two 3 to 2 1/2 inch header reducers and a set of extra thick 1/8 inch gaskets. The header-collector reducers are nickel plated for a long lasting, great looking finish. These header-collector reducers also have a 3-bolt welded on flange with a 2-1/2 inch reducer pipe to allow you to attach a 2-1/2 inch pipe to a 3 inch flange. The gaskets are compressed of ceramic fiber (CCF), which is designed to exceed typical non-asbestos type gaskets. The CCF is designed to not deteriorate or crack from excessive heat or pressure. This universal application includes necessary nuts and bolts made from nickel plated steel. Spectre s Header-Collector Reducer kit includes two 3 to 2 1/2 inch header reducers and a set of extra thick 1/8 inch gaskets. The header-collector reducers are nickel plated for a long lasting; great looking finish.