GoolRC High Performance 2838 6200KV KV6200 Sensorless Brushless Motor for RC Car Boat 100% Brand New. Low heat production, long lifetime, strong overload protection and it can function 95% of its features without any heat sink appliance. High torque & high efficiency. The overall efficiency exceed 90 percent. High quality materials adopted: high intense aluminum alloy anodizing shell , front & back cover , high-performance temperature-resistant magnetic steel and imported high-speed bearing. High quality and durable in use.