This pinion gear is composed of hard anodized chrome metal, it's 48-53HRC certified. You can find the vigor you need the car through changing pinion gear. With comparable outside gear, you'll improve your pinion gear (within allowable range) to obtain different torque and rate. (the reduced the T count, the more wide range of high priced the torque; the larger the T count, the faster the cost.)
Specifications: 5mm Bore Diameter/0.53mm Modulus/40CR Metal Pinion
Applications: 1/10th SCT/Truck/Monster Vehicle (i.e. TRAXXAS 1/10 SLASH 4*4)