Extremely powerful and fast, these are the servos we have been using on all our giant scale models. We have had zero failures after many, many flights, and like them enough to offer them to you at an affordable price. They are metal geared and feature twin ball bearings, and come with all hardware. Model: HD-9110MG Voltage: 4.5v~6v Speed: .19sec Torque: 10.5kg/cm Bearings: 2BB Gears: Metal Weight: 49g Size: 40x20x38mm