Replacement Ceramic Hybrid bearings for use with our DUB threaded (BSA) bottom brackets. We have selected to use Ceramic hybrid bearings as they offer several advantages over their steel bearing equivalents, the ceramic balls are perfectly spherical which provides a lower rolling resistance with an increase in service life, higher corrosion resistance, and lighter weight (ceramic balls are 40% lighter than steel), which makes them the optimal choice for mountain and road bike bottom brackets, with the 2 rubber seals acting as a barrier to help lock out dirt and ingress, also keeping the lubrication trapped inside.