The CERAMICSPEED Shimano 10/11s Ultegra/Dura Ace Coated Pulleys Black are high-quality spare parts for your bike's transmission system. These pulleys are designed to fit Shimano 10/11-speed Ultegra and Dura Ace groupsets, and their sleek black finish adds a stylish touch to your bike's appearance. The coated ceramic bearings provide excellent durability and minimal friction, improving the overall efficiency of your bike's transmission. With these top-of-the-line pulleys from CERAMICSPEED, you can enjoy smoother shifting and a more efficient riding experience.