Steel...and depending on what engine you're running, you may want to have a 3 or maybe even a 4 disc, your driving style has a lot to do with it, if you're off the throttle alot, very likely you're gonna burn up the disc's in a 2disc, it's no good to be dnf ing because of clutch failure, well worth the extra $$$ to have a good steel basket 3 or 4 disc clutch on a jackshaft imo...