Feature:100% Brand New.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.Specifications:Package size: 10 * 8 * 8 cm / 4 * 3.2 * 3.2 inPackage weight: 118 g / 4.1 ozPackage list:1 * 2445 3000KV Sensorless Brushless Motor