These are the Heavy Duty 12mm Alloy Hex Wheel Hubs from HPI Alloy construction, silver in color Will not melt like stock plastic parts are prone to do Four hex hubs Four pins Installation following the kit manual This part replaces the stock part found in the MT2 18SS. Will fit the MT2/MT/Rush (rear) and the EP MT. jb 4/19/05 ir/jxs &