Inhouse product
The Tower Pro MG90S micro servo has metal gears inside of it instead of the standard plastic gears found in many servos.
Specification:
Stall torque: 2.2kg/cm(4.8V )2.5kg/cm(6V)
Operating speed: 0.11sec/60degree(4.8v), 0.10sec/60degree(6v)
Operating voltage: 4.8-6.0V
Dead band width: 10us
Dimension: 23*12.2*29mm
Weight: 14g