1Waterproof motor,waterproof design ensures safe operation, which extends its service life. 2Durable bearing, superior bearing is accurate and durable with low noise and small friction. 3Efficient windings,high purity copper windings maximizes efficiency, accurate design to achieve maximum energy coverage. 4Fine Workman, CNC machined billet, 6061T6 aluminum heatsink. Secondary oxidation treatment for exquisite appearance. 5The precisely balanced rotor provides smoothness with the best reliability, ensuring no noise, no vibration, and smooth operation. Item Type: 3660 3800KV Brushless Motor Material: Aluminum Alloy + Copper Color: Black Weight: Approx. 244g/8.6oz Size: Approx. 36x60mm/1.4x2.4in Shaft Length: Approx. 17mm/0.7in Shaft Diameter: Approx. 5mm/0.2in Maximum Voltage:1 x Motor1. Avoid working temperature exceeding 65C (150F).2. Do not touch the motor after use, because the motor may overheat.3. Allow the motor to cool completely between uses.4. Make sure to use the correct size motor mounting screws.5. Do not over tighten the motor mounting screws.