Descriptions: 1> Motor:4 poles Hi-torque motor design.CNC machined 6061 T6 billet alumium heatsink can.High purity copper windings maximizes efficiency.High RPM ABEC5 oversized bearings.Universal fits 1/18 brushless cars-multi-mounting system for M2.5 screws.Precision balanced rotor, smoothness for best reliability and maximum RPM.Stator - Super Thin (0.35mm) laminations.Removable/replaceable.Precision engineered for maximum energy conversion.2> Electric Speed Controller:Compatible with sensorless brushless motors.High anti-interference capability.Using advanced software interface to set up or update the software.Super smooth and accurate throttle linearity.Fast response to throttle input.Multiple protection features: low voltage cut-off protection, over-heat protection and throttle signal loss protection.Specifications: 1> MotorRPM: 7200KVMax Current: 24AMax Watts: 200WCan Size: 2430Sensored: NoShaft Diameter: 2mmShaft Length: 12mmBullet Connector: 3.5mmMax voltage: 7.4V(2S)2> Electric Speed Controller:Cont. Current: 25ABurst Current: 90A/10secBattery: 2 Cell Lipo / 4-6 Cell NiMhBEC: YesBEC Output: 5V/1APower Supply Plugs: T MaleMotor Plugs: Female 3.5mm Bullet ConnectorMotor Size: Approx. 41 x 24mm/ 1.6 x 0.9inch(Height x diameter)ESC Size:Approx. 37 x 26 x 14mm/1.5 x 1 x 0.6 inchPackage Included:1pc * 2430 7200KV 4P Sensorless Brushless Motor1pc * 25A Brushless Electric Speed Controller1pc * manual