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High torque & high efficiency. The overall efficiency exceed 90 percent. Low heat production, long lifetime, strong overload protection and it can function 95% of its features without any heat sink appliance. 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. All products are tested for stability, consistency and reliability.