The HD-1810MG is a great, high-performance actuator for small mechanisms. Digital electronics coupled with mostly metal gears and a ball bearing give this servo a distinct edge over similarly sized servos. The lead is terminated with a standard “JR”-style connector, which is Futaba-compatible. The pictures below show the metal gear train and an example of the hardware that might be included with this servo (hardware might vary).
You can find more information about this servo under the specifications tab and in its datasheet (117k pdf).
Note that, as with most hobby servos, stalling or back-driving this servo can strip its gears.