The Motor XING 5215 designed for bigger X-Class quads like 11-15 inch quad frames, which is with better efficiency in this range frames.The XING 5215 features Japan NSK bearing, N52H arc magnets. It offers incredible thrust number, highly responsive and extremely smooth flight characteristics. The bigger stator size 5215 allows it to provide instant power to save you from those crazy mountain dives last minute. It’s a great motor if you’re building bigger drones like 13 inch or 15 inch.