Traxxas TRX-4M Brushless Power System (ECM & Motor)The TRX 4M Brushless Power System gives you up to 50% more speed, more crawling torque, and greater precision than brushed power systems. Rip wheelies in your monster truck or navigate a technical crawling course in your custom High Trail rig. The new TRX 4M Brushless Power System gives you the best of both worlds! Brushless outrunner motor More torque and low speed control than conventional designs 3350 Kv Laser etched can Includes 11 tooth pinion