Futaba S3305 Standard High-Torque Servo with Metal Gears For use in RC cars and boats that require standard-size, high-torque servos Two ball bearings 3-pole motor One-year warranty Includes S3305 servo, 1.5 in (39 mm) diameter horn, 1.2 in (32 mm) 6-point horn, 4 eyelets, 4 rubber grommets, and 4 mounting screws