Etronix standard-sized waterproof digital servo. Full selection on servo horns, mounting rubber and hardware included. Spec Check: Speed (sec/60°): @6.0v 0.16s Torque (kg-cm): @6.0v 21.8kg Dimensions: 40.5 x 20.2 x 38mm Weight: 58g Gears: Metal Case: Metal/Plastic