This pinion gear is made of difficult anodized chrome steel, it really is 48-53HRC certified. You'll get the power you will need the auto through changing pinion gear. With comparable outside gear, you can improve your pinion gear (within allowable range) for various torque and price. (the lower the T count, greater the torque; greater the T count, the faster the purchase price.)
Specifications: 5mm Bore Diameter/0.53 Modulus/40CR metal Pinion
Applications: 1/10th SCT/Truck/Monster automobile (in other words. TRAXXAS 1/10 SLASH 4*4)