This RCSF Elite E9DLSZ nano servo is designed for RC airplanes, helicopters, and gliders. It weighs only 11 grams (0.388 oz), yet it delivers 27.8 oz-in. of torque when powered by 6.0 volts DC. The E9DLSZ features a plastic case, high-precision metal gears, and a DC motor. It is a perfect pick for helicopter, airplane and glider applications. It comes with plastic control plastic arms plus mounting screws—aluminum arms are available as an option.