Stewy runs on six of these. The MG90S is a 9g servo with all-metal gears, which holds up a lot better than plastic-gear alternatives under the constant load of moving the platform. Each one puts out up to 2.2 kg/cm of torque at 6V and moves at 0.08 sec/60 degrees.

Servo horns and M2.5 screws are included with each servo. We sell them in packs of 7 so you have one spare on hand.