This kit uses twenty "MG996 Metal Gear High Torque Servo", but we noted this model hasn't been legitimately manufactured in over 15 years. Thus, the dodgy kit we were given also needed several replacement servos, as defects in the brass gears would chip easily. Also, the platform itself is a rather delicate design, and prone to breaking parts with small errors in locomotion sequencing/calibration that over stress a leg.

• Servo Weight : 55g (just over 2 oz)
• Operating Speed : 0.17sec / 60 degrees (4.8V no load)
• Stall Torque : 9 kg-cm (180.5 oz-in) at 4.8V
• Voltage : 4.8 - 7.2Volts

Additionally, the metal servo-horns and thread-lock screw adhesive are crucial in making the unit work correctly, as plastic parts would simply break. Note, each servos extreme position is aligned with the collision point with the frames, as this allowed the control software to behave more consistently on the two platforms. Also, by allowing the robot to rest on the servo end-stops while standing still, the platform expends less power while not in locomotion.