The Ceramicspeed OSPW Shimano 9100/9150 and R8000 pulleys are high-quality ceramic components designed specifically for Shimano rear derailleurs.Designed for 10/11speed shimano Derailleurs. These coated red pulleys offer a smooth and efficient performance, enhancing the overall functionality of your bicycle. Made with durable ceramic material, these pulleys are compatible with Shimano 9100 and 9150 rear derailleur models. Upgrade your cycling experience with these precision-engineered CeramicSpeed OSPW pulleys.