The set includes a 2430 7200KV 4P Brushless Motor and a 25A brushless Electric Speed Controller(ESC), which is perfect for the 1/16 1/18 RC auto car on road. This 2430 Brushless Motor is built from the best materials available, and is designed to provide both quality and performance at an affordable price. And it's with high quality aluminum alloy parts that are produced on the latest CNC milling machines. Additionally, the 25A brushless ESC Features enhanced throttle response,excellent acceleration, strong breaks and throttle linearity. Motor Features: 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 1/16 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. Specification: RPM: 7200KV Max Current: 24A Max Watts: 200W Can Size: 2430 Sensored: No Can Diameter: 24mm Can Length: 30mm Shaft Diameter: 2mm Shaft Length: 12mm Bullet Connector: 3.5mm Weight: 45.5g/1.6oz Max voltage: 7.4V(2S) Note: there's some little error from human measuring. Electric Speed Controller Features: 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. Mutiple protection Features: low voltage cut-off protection, over-heat protection and throttle signal loss protection. Specifications: Cont. Current: 25A Burst Current: 90A/10sec Battery: 2 Cell Lipo / 4-6 Cell NiMh BEC: Yes BEC Output: 5V/1A Power Supply Plugs: T Male Motor Plugs: Female 3.5mm Bullet Connector Size: 40*27*15mm Weight: 29g /1oz Package size: 10 * 8 * 6.5cm/ 3.9 * 3.1 * 2.5in Package weight: 105g/3.7 oz Package List: 1 * 2430 7200KV 4P Sensorless Brushless Motor 1 * 25A Brushless Electric Speed Controller