X-standard Arm Sets This is an arm set series for industrial drones with motors, FOC ESCs and X-carbon props integrated in one.(The tube sizes available are 30mm and 25mm with an adapter ring to switch from one to another.) Smart and Efficient - FOC (sine wave) ESCs are default match for the arm sets. The efficient, accurate and stable motor control from intelligent algorithm meets the demand of various applications. High RPM, High Efficiency, Strong Power - X.carbon is a new patent polymer folding prop series of high RPM, high efficiency, and strong power. (X-carbon props are the default match. Other props from T-MOTOR are available) LED light - The built-in LED light for better maneuverability. Convenient installation - Free of complicated mounting process