This motor was sent to us with a damaged outside box. The motor is tested and fine.SSS 4092 V2 brushless motor. Save $20, usually $99.99. Special while supplies last! FREE Water Jacket with TFL SSS Purchase! 40mm Diameter by 92mm Long Brushless Motor by TFL Racing. Hand-wound for high efficiency of up to 90%. Comes with high-quality bearings and neodymium magnets for high power. Includes endbells that are assembled with screws for both strength and ease of maintenance. Vented endbell and front mounting plate for additional air cooling. 4-Pole brushless motor Specs: Magnets: neodymium Watts: 3000 Watts Continuous, 6000 Max Watts Poles: 4 Motor Shaft: 5mm with a flat spot Can measures: 40mm diameter x 92mm long Weight: 530 Grams Mounting screw diameter required: 3mm Bearing size: Mounting Holes 25mm apart for use with most 540 mounts. Connectors: 6mm Male Bullet connectors preinstalled onto the motor. OSE suggests 20,000-35,000 total rpm for boats. We recommend that most Fast Electric Boaters run in the 25,000 RPM range for Sport Boating or the 30,000 RPM range for racing. These are only guidelines, we suggest if you do not know to pick the correct motor, please consult us first or other members of the rc fast electric boating community, either at a local club or on our OSE Forums.