The Proper ceramic bearing hubs use a ceramic bush instead of the usual 3 small sealed bearings. The ceramic material is very hard wearing but also runs like a bearing so there's very little friction. These ceramic bearings will last for ages because the forces coming through from the chain is spread over a much larger area than with regular bearings...
Female bolt type axle
Hollow 8000 series Heat Treated crmo axle
New 4 pawl driver with ceramic bearing, no more blown bearings...
High quality sealed bearings
Large alloy cones for extra strength
Drive and non drive side hubguards available
Uses 2 x 6902 bearings in body of the hub