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As RC drivers continue their quest for more speed and better performance, the clutch bell is a constant source of problems due to excessive heat buildup. The heat levels cause the steel balls to expand and subjects the retainer to a tremendous amount of abuse, as a result the bearings fail prematurely. Our ceramic lightning hybrid bearings come with top of the line Silicon Nitride Ceramic Balls, which are several times harder than steel and are virtually frictionless. Because Ceramic is impervious to heat there are no issues with the balls expanding as temperatures rise.