This is Yikong Parts 18020 Plastic 38/15T Differential Gear for 1:18 Yikong RC cars，
which will greatly improve the steady when the car is turning a corner.

Specification:
Materials: Plastic.
Differential gear diameter: 2.8cm
Package Size: 10.2 * 5.5 * 1cm / 4 * 2.2 * 0.4in
Package Weight: 11g / 0.4oz
Adhesive Tap Package

Package List:
2 * 18020 Differential Gear