SKY RC ARES V2.1 Spec Motor 10.5T - SK-400003-57Effective ventilation. Extreme performance. In more dazzling shape featuring multiple cooling engraved fins for added heat dissipating surface area, the motor is implementing thermal silicone insulator between the endbell and stator to conduct the internal heat to the case with the temperate reduced efficiently, and power output multiplied! Features Aluminum Shell with CNC Forming Process Pure Copper Coil with High Conductivity High Power Welding