Feature: 1. Copper Windings and Bearings: High purity copper windings and sealed bearings are durable, with low friction and low noise. 2. Welding Guide: Excellent torque and long life, direct welding wiring guide, providing flexible welding options. 3. Accurately Balanced Rotor: can achieve maximum energy conversion, smoothness improves reliability and maximum speed. 4. High Purity and Strength: High purity copper winding maximizes efficiency, and high strength magnets provide stable brushed motor performance. 5. Rotor Function: Rotor is precisely balanced, with high smoothness, good stability, excellent performance, and easy disassembly and assembly. 6. 550 Brushed Motor: High torque is used for drifting of climbers and bicycles, bidirectional bearings have strong magnetic force, low heat generation, and high power. Specification: Item Type: 550 Brushed Motor 320A ESC Color: As Pictures Shown Material: Plastic + Copper Weight: Approx.270g/9.5oz Motor: Operating Voltage: 7.4-12V Motor Length: Approx. 60mm/2.4in (without Shaft) Motor Diameter: Approx. 36mm/1.4in Shaft Diameter: Approx. 3.175mm/0.1in Motor Shaft Length: Approx. 11mm/0.4in 320A ESC: Working Voltage: 5-11V NI-MH, NI-CD Group 4-6S: (4.8 V - 7.2 V) Lithium Battery 3S: (7.4V-11.1V) Power Supply: 2~3S Lithium Battery, Ni-mh Battery 5~9S BEC Output: 5 V / 2A (Receiver, Steering Gear Power Supply) Product Size: Approx. 43x29x27mm/1.7x1.1x1.1in (no Cable) Continuous Output Current: 320A (Forward), 160A (Reverse), 270A (Brake) . Package List: 1 x 550 Brush Motor2 x Wiring1 x 320A Brush ESC Note: B1. Due to manual measurement, 1‑3mm error is allowed, thank you.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.3. Product wires are shipped without welding. Product is splash proof and cannot be waded.