GoolRC 3660 4Poles 2600KV Brushless Motor for RC 1/8 1/10 Truck off-road Car Boat 3660 4Poles 2600KV Brushless Motor for RC 1/8 1/10 Truck off-road Car Boat. Low heat production, long lifetime, strong overload protection and it can function 95% of its features without any heat sink appliance. 4Poles design, 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.