This pinion gear is constructed of hard anodized chrome metal, it is 48-53HRC certified. You may get the power you want for the car through changing pinion gear. With similar outside gear, you are able to change your pinion gear (within allowable range) to have various torque and speed. (the reduced the T count, the bigger the torque; the larger the T count, the faster the speed.)
Specification: Bore Diameter: 5mm / Modulus: 0.8mm / Steel Pinion: 40CR
Applications: 1/8th monster such as E-MAXX, E-REVO, SUMMIT etc.