This pinion gear is constructed of hard anodized chrome metal, it's 48-53HRC certified. You can get the ability you need for your automobile through changing pinion gear. With the same outside gear, you'll improve your pinion gear (within allowable range) for various torque and speed. (The lower the T count, the bigger the torque; the larger the T count, the quicker the speed.)
Specification: Bore Diameter: 5mm / Modulus: 0.8mm / metal Pinion: 40CR
Applications: 1/8th monster including E-MAXX, E-REVO, SUMMIT, 1/10th SLASH 4*4 an such like.