This is a new, unused OP parts carbon chassis kit for Tamiya's Group C chassis, Mercedes-Benz C11, XJR12, and R91CP. Made with the highest quality aluminum alloy material, it combines durability with a beautiful finish. It's perfect for replacing old or damaged parts and can improve the running performance of your model car. The size matches the original vehicle design 100%, so no processing or size adjustments are needed. You can use the original car's mounting holes as they are, allowing for smooth installation. Please use it for the maintenance and customization of your precious model car. If you have any questions or concerns, please feel free to comment. We will respond quickly and politely.