Check the listing for details. Shimano Hollowtech II Bottom Bracket B O-Ring Pack Durable Sealing Components. Condition: New. Listed at 13.34 USD. Bundle Title: Shimano Hollowtech II Bottom Bracket "B" O-Ring Replacement Kit High-Performance Sealing Components for Bike Cranksets Product Description: Upgrade your Shimano Hollowtech II crankset with this essential Bottom Bracket "B" O-Ring Replacement Kit, featuring two durable, high-quality O-rings designed for optimal sealing and smooth performance. Crafted from precision-engineered materials, these O-rings provide a reliable barrier against dirt, water, and debris, ensuring the longevity and efficiency of your bottom bracket system. Specifically compatible with Shimano Hollowtech II cranksets, these components are vital for maintaining proper fit and preventing contamination that can cause premature wear. Engineered with advanced rubber elastomers, these O-rings deliver superior.