Features: Suitable for Remote Control model: 16421 16208 07 14209 14210 14303. Metal materials, not easy to deform. A great and upgraded part for the model car, can replace the old parts,increasing steering effort. Get the stability and balancing of the vehicle during driving. Easy and convenient to install and remove. As part of normal maintenance, it can be easily removed and replaced. Specifications: Component: High Carbon Steel+Customized Bearings Size: Approx.11x23mm/0.43x0.90inch Quantity: 1 Set Package Includes: 1 Set Remote Control Car Differential Cup note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.