This pinion gear is constructed of difficult anodized chrome metal, it is actually 48-53HRC certified. You will get the power you will need the auto through changing pinion gear. With comparable outside gear, you are able to enhance your pinion gear (within allowable range) for various torque and cost. (the reduced the T count, greater the torque; greater the T count, the quicker the price.)
Specifications: 5mm Bore Diameter/0.53 Modulus/40CR metal Pinion
Applications: 1/10th SCT/Truck/Monster car (in other words. TRAXXAS 1/10 SLASH 4*4)