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Extra hard high carbon brushless motor pinions are built to last with our hi-performance GEN3 steel slipper units. All pinions precision machined and stamped with the number of teeth. One 4 m/m set screw included. 2 m/m allen wrench (not included) fits the 4 m/m set screw. Can be run on cars using a 5 m/m motor shaft including Traxxas, Associated, and HPI models.