1406-4600KV 4-Pole Censored Brushless MotorDetails: For more than a decade castle has been providing award winning brushless sensorless motors to R C enthusiasts worldwide. In response to overwhelming requests by our customers, we have brought technological advancements together that will deliver unprecedented performance in our new sensory motor line. Why sensored? drivers in all applications demand clean starts when coming off the line. Crawler fans require high precision low speed control