1Aluminum Covers and Copper Coils: CNC machined aluminum front and rear covers. High purity and high temperature resistant copper coils effectively provide high efficiency. 2Balanced Rotor: Precisely balanced rotor, providing high smoothness, reliability and maximum speed. And the motor size is 40x25mm/1.6x1.0in. 3Output Shaft and Bearing: The motor uses high toughness stainless steel output shaft, high accuracy high quality bearings make the motor super durability. 4Applicable Model: QM4208 680KV brushless motor is suitable for suitable for 450, 550, 650, 850 and other multi rotor remote control drones. 5Product Parameter: Maximum continuous power/10 seconds(W)/10S is 500W, maximum continuous current(A)/10S/10 seconds is 23A. Item Type: QM4208 680KV Brushless MotorMaterial: Aluminum Alloy + Copper + Stainless SteelSpeed: 680KVConfiguration: 12N 14PColor: As Pictures ShownWeight: Approx. 165g / 5.8ozMotor Size (Diaxl): Approx. 40x25mm / 1.6x1.0inNumber of Lithium Batteries: 4-6S LipoMaximum Continuous Power/10 Seconds (W)/10S: 500WMaximum Continuous Current (A)/10S/10 Seconds: 23AApplication: Suitable for RC Airplane Fixed Wing 1 x Motor12 x Screw1 x Propeller Clip1 x Accessory6 x Heat Shrinkable Rubber Ring3 x Banana Head Male3 x Banana Head Female1 x Manual1 x Storage Box 1.CW: clockwise, CCW: counterclockwise counterclockwise2. Due to manual measurement, please allow 1& 8209;3mm error, thank you 3. Due to the difference between different monitors, the picture may not reflect the actual color of the item.