This is the optional 15 tooth clutch bell for the Losi 8IGHT buggy. The clutch bell sits over the clutch shoes, and will be engaged when the engine rpm's increase. It will allow the engines power to pass to the center spur gear and the rest of the drive train. The smaller the clutch bell, the more bottom end acceleration the buggy will have, but with less top end speed. A clutch bell with more teeth with increase top end for those that are looking for a higher top speed, but will reduce bottom end acceleration.
this is the most rediculously out of round clutch bell i have ever seen i sat it on the end blade of a measuring caliper and turned it and it was a half millimeter low or high in two different spots and it's not worth the trouble sending it back with the shipping cost and time you just have to learn what company to not buy parts from (meaning team losi ) not A-Main hopefully when it gets hot enough it will start to true up ,i will have to try it untill i save twenty more dollars to spend on hobby parts have a nice day at the track all you hobby people