Our Super Single series make an ideal choice as a replacement to the original equipment clutch/flywheel and provide your vehicle with unparallel response and race performance. The Supersingle clutch design is a product of our cumulative knowledge and experience in developing and refining our Racing Multiplate Clutch line. Steel Pressure Plate - total weight is 25lbs - All OS clutches come with the flywheel, and are matched accordingly. The OS flywheel is typically 20% or so lighter than stock (but depends per application) Also, the free-floating pressure plate design and specially-bonded disks allow for increased longevity; an OS clutch will still grab on virtually paper-thin disks; many race teams will go through an entire season or longer before needing a rebuild. - The STR and Super Single clutches all come with the release sleeve assembly included. (TS/TR/R series clutches have them sold separately)