Features: High intense aluminum alloy shell, low heat production, long lifetime and strong overload protection for better work efficiency. Designed for 1/10 scale RC car, boat, etc. 2 poles design provides high torque and efficiency. 4.0mm gold-plated banana plugs for easy connection with no soldering needed. Oversized bearing with balanced rotor ensures smooth operation and max RPM. Low gravitational center with light weight will reduce the rack shocking caused by motor rotating. Specifications: Material: Aluminium Alloy Color: Orange Options: 9T-4370KV, 10T-3930KV Power: 550W Connector: 4.0mm Gold-Plated Banana Plug Type: RC Accessory Waterproof Rate: Splash Proof Weight: 172g KV Watts Max Voltage Max Current Internal Resistance(Ω) Max RPM Length Outer Diameter/W/Fins Shaft Diameter Shaft Length Turns Rotor(Pole) Stator Length Max Efficiency(%) 4370KV 550 12V 46A 0.0127 50000 50mm 35.8mm / 1.4inch 3.175 15mm / 0.6inch 9.0T 2Poles 25mm / 1inch 86%-90% 3930KV 550 13V 42A 0.0155 50000 50mm 35.8mm / 1.4inch 3.175 15mm / 0.6inch 10.0T 2Poles 25mm / 1inch 86%-90% Package Include: 1 x Motor 1、High intense aluminum alloy shell, low heat production, long lifetime and strong overload protection for better work efficiency 2、2 poles design provides high torque and efficiency 3、4.0mm gold-plated banana plugs for easy connection with no soldering needed 4、Oversized bearing with balanced rotor ensures smooth operation and max RPM 5、Low gravitational center with light weight will reduce the rack shocking caused by motor rotating