This differential is suitable for WLtoys K989 RC Car. Its high quality and durable performance can bring lots of racing joy. It's light and very effective to adjust speed difference between left and right wheels when the car is turning. Definitely best choice for your K989! Features: Easy to install and replace the old one. Very effective to adjust speed difference between left and right wheels when the car is turning. Specially suitable for WLtoys K989 RC car. Very light weight and portable to carry. If there are any problems, please contact our store in time. We will give you a satisfactory solution. Specifications: Brand name: WLtoys Item name: Differential Material: Plastic Suitable for: WLtoys K989 RC car Item weight: 4g/2pcs Package information: Package size: 10*6.5*2cm Package weight: 12g Poly bag package Packing list: 2 * Differential