Feature: 1. 4 poles 12 Slot Hi-torque motor design. 2. CNC machined 6061 T6 billet alumium heatsink can motor. 3. The motor features high purity copper windings maximizes efficiency. 4. ESC:advanced software interface to set up or update the software. 5. Mutiple protection features of the ESC: low voltage cut-off protection, over-heat protection and throttle signal loss protection. Specification: The set includes a 3674 2250KV 4P Brushless Motor and a 120A brushless Electric Speed Controller(ESC), which is perfect for the 1/8 RC car truck on road. This 3674 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 120A 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 1/8 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. Specification: RPM: 2250KV Max Current: 80A Max Watts: 1800W Can Size: 3674 Sensored: No Can Diameter: 36mm Can Length: 74mm Shaft Diameter: 5mm Shaft Length: 17mm Bullet Connector: 4mm Weight: 293.5g/10.4oz Max voltage: 7.4V(2S)-18.5V(5S) 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: 120A Burst Current: 600A/10sec Battery: 2-4 Cell Lipo / 4-8 Cell NiMh SBEC: Yes SBEC Output: 6.1V/3A Power Supply Plugs: T Male Motor Plugs: Female 4mm Bullet Connector Size: 55*43*40mm(with out fan) Weight: 116.1g /4.1oz Package size: 11 * 9 * 6.5cm/ 4.3 * 3.5 * 2.5in Package weight: 446g/15.7oz Package list: 1 * 3674 2250KV 4P Sensorless Brushless Motor 1 * 120A Brushless Electric Speed Controller Package List: 1 * 3674 2250KV 4P Sensorless Brushless Motor 1 * 120A Brushless Electric Speed Controller