?This is Yikong Parts 18020 Plastic 38/15T Differential Gear for 1:18 Yikong RC cars，<br> which will greatly improve the steady when the car is turning a corner.<br> <br> Specification:<br> Materials: Plastic.<br> Differential gear diameter: 2.8cm<br> Package Size: 10.2 * 5.5 * 1cm / 4 * 2.2 * 0.4in<br> Package Weight: 11g / 0.4oz<br> Adhesive Tap Package<br> <br> Package List:<br> 2 * 18020 Differential Gear<br>  <br>  <br>  <br>  <br>  <br>  <br>