You get two choices with Hitecs most popular servo the HS-81, resin or metal gears. A popular servo for smaller airplanes, helis, boats, cars and trucks, the HS-81 offers a fine balance between speed and torque.
Motor Type: 3 Pole
Bearing Type: None
Speed: 0.11 / 0.09 sec @ 60 deg.
Torque: 36.10 / 41.66 oz.in (4.8v/6v) / 2.6 / 3.0 kg.cm
Size: 1.17″ x 0.47″ x 1.16″ / 29.80 x 12.00 x 29.60mm