Feature: 1. Compatibility: RC differential with bearings is fit for Wltoys 284010, 284161, K989(new version), 284131(new version) spare parts, please check these carefully. 2. Durable Materials: Rc ball differential is made of the best plastic and stainless steel materials, excellent performance, light weight, strong and durable. 3. DIY Repair Accessories: Our ball differential are upgrade modified DIY accessories to replace your RC car toys, with premium fine workmanship, perfect style. 4. Easy Installation: The RC differential cup belt bearing is easy to install and remove, and easy to upgrade your RC car, which will not take you too much time. 5. Premium Replacement: This 2pcs premium replacement differential is fit for your old or broken rc car parts, and can make your car works and runs properly . Specification: Item Type: RC Car Differential with Bearing Material: Plastic + stainless steel Application: Fit for wltoys 284010, 284161, K989 new version, 284131 new version and other remote control cars Package List: 2 x Differential 4 x Bearing Note: K989 old version, 284131 old version is not common, please distinguish yourself