The Shimano HB-M770-S Ball Retainer is a high-quality replacement part designed for Shimano hubs. Weighing just 10 grams, this ball retainer ensures smooth and reliable performance for your hub system. Crafted with precision engineering, it features durable construction to withstand the rigors of cycling. The HB-M770-S Ball Retainer is compatible with various Shimano hub models, providing a perfect fit and seamless operation. This essential component helps maintain the integrity of your hub, ensuring optimal functionality and longevity. Trust Shimano's reputation for excellence in cycling components and upgrade your hub with the HB-M770-S Ball Retainer for a dependable and efficient riding experience.