Features: ?High performance?High purity copper windings maximizes efficiency. ?High Torque?Precision engineered for maximum energy conversion. Precision balanced rotor, smoothness for best reliability and maximum RPM. ?Superior Material?CNC machined 6061 T6 billet aluminum heatsink can. ESC has enhanced throttle response, excellent acceleration, powerful interruptions and super smooth and accurate throttle linearity. Motor Specifications: Size: S3650 Watts: 900W Max voltage: 12V Max Amps: 69A KV(RPM/Volt): 3900KV Max RPM: 50000 Diameter: 36mm Length: 50mm Shaft length: 15mm Shaft diameter: 3.175mm Plug type: 4mm golden banana plug 60A ESC Specification: ESC Size:51.8 38.9 34.5mm/2.03 1.53 1.35in ESC Constant Current:60A ESC Burst Current:180A Battery:4-9 cell Ni-MH battery / 2-3S Li-po battery BEC:Yes Power Connector of ESC:T Male Plug Motor Connector of ESC:4mm Banana Female Plug Package Including: 1 * S3650 3900KV Motor 1 * 60A ESC 1 * Programming Card 1 * Cooling Fan