The set includes a 3650 3100KV/4P Brushless Motor and a 60A brushless Electric Speed Controller(ESC), which is perfect for the 1/10 RC auto car truck on road. This 3650 3100KV/4P 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 60A 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 fit all 1/10 brushless cars-multi-mounting system for M3 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. ROAR legal. Specification: RPM: 3100KV Max Current: 56A Max Watts: 900W Can Size: 3650 Sensored: No Can Diameter: 36mm Can Length: 50mm Shaft Diameter: 3.175mm Shaft Length: 15mm Bullet Connector: 4mm Weight: 180.8g/6.4oz Max voltage: 7.4V(2S)-14.8V(4S) 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: 60A Burst Current: 320A/10sec Battery: 2-3 Cell Lipo / 4-9 Cell NiMh SBEC: Yes SBEC Output: 5.8V/3A Power Supply Plugs: T Male Motor Plugs: Female 4mm Bullet Connector Size: 45*35*35mm(with out fan) Weight: 76.3g / 2.68oz Package size: 10 * 8 * 6.5cm/ 3.9 * 3.1 * 2.5in Package weight: 288g/10.1 oz Package List: 1 * 3650 3100KV 4P Sensorless Brushless Motor 1 * 60A Brushless Electric Speed Controller