Feature:1.4Poles design， high torque & high efficiency. The overall efficiency exceed 90 percent.2.Low heat production， long lifetime， strong overload protection and it can function 95% of its features without any heat sink appliance.3.high quality materials adopted: high intense aluminum alloy anodizing shell ， front & back cover ， high-performance temperature-resistant magnetic steel and imported high-speed bearingSpecifications:Model: 3650Dimension: R36 * 50mmKV(RPM/V): 5200KVPoles: 4Watts: 900WMax Voltage: <9.6VMax Amps: 94AShaft diameter: 3.17mmConnector: 4.0mm gold plugRecommend model: Car，BoatPackage size: 9.5 * 8 * 6.3cm / 3.7 * 3.1 * 2.5inPackage weight: 217g / 7.7ozPackage list:1 * 3650 4Poles 5200KV BL Brushless Motor