6224218-1 is a 6-pad spring-centered race discs made with high-quality ceramic friction materials. The engagement is harsher, but shifting is faster. The heavy-duty torsional dampening springs are stronger, in most cases, than standard springs and are provided in the best sizes and spring rates to suit the application. The 6-pad, spring-centered disc is recommended for larger clutch sizes to absorb more heat and for smoother engagement.