Independent receiver and 45A ESC make this car more potential and upgradeable Durable and Efficient Transmission: Metal gears and metal differential better distribute power to achieve a perfect 4WD, in which the 5.5MM diameter axle and M4 nuts contributed. Brushless: Hobby 2845 4200KV, 4 pole high-torque motor with metal heatsink and cooling fans design. The smooth effect of 16 ball bearings reduces power loss Application of new materials: After many violent tests, the material developed for the honeycomb chassis is strong enough to withstand the impact of this monster truck.