This pinion gear is made from difficult anodized chrome steel, it's 48-53HRC certified. You will get the capability you'll need for your automobile through changing pinion gear. With the same exterior gear, you'll enhance your pinion gear (within allowable range) for various torque and speed. (the reduced the T count, greater the torque; the larger the T count, the quicker the rate.)
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 and so on.