Hardened steel clutch bell for Blackbone gears.  Designed to withstand the heat and punishment of todays big HP engines.  When using this bell you will need to use blackbone gears. They will not work with stock HPI gears.  This bell has a 15mm shaft so you will also need to use the Taylor/Rcmax or turtle clutch bell carrier and clutch back plate. They allow for the use of the larger shaft and bearing size.