This pinion gear is made of difficult anodized chrome steel, its 48-53HRC certified. You will get the power you will require the auto through changing pinion gear. With the same outside gear, you are going to boost your pinion gear (within allowable range) for different torque and cost. (the paid down the T count, greater the torque; the greater costly the T count, the quicker the price.)
Specification: Bore Diameter: 5mm / Modulus: 0.8mm / steel Pinion: 40CR
Applications: 1/8th monster including E-MAXX, E-REVO, SUMMIT, 1/10th SLASH 4*4 and so on.