The CERAMICSPEED OSPW Alloy Shimano DA9200 / ULT8100 Aero Ceramic Pulley in Black is a high-performance upgrade for your bike. Made with a lightweight alloy construction and ceramic bearings, these pulleys provide smoother and more efficient shifting. The black color adds a sleek and stylish touch to your bike. The product is compatible with Shimano DA9200 and ULT8100 groupsets. With its aerodynamic design, it helps reduce drag and improve your bike's speed. The pulleys also have a longer lifespan compared to traditional pulleys, making them a cost-effective choice for serious riders. Features: - Lightweight alloy construction - Ceramic bearings for smoother shifting - Compatible with Shimano DA9200 and ULT8100 groupsets - Aerodynamic design to reduce drag - Longer lifespan compared to traditional pulleys