Precisioned cnc aluminium bottom bracket cup/housing instead of plastic housing.
C-Bear took a very early position not to use plastic cups (back in 2011/12 when most were adding all sorts of plastic accessory parts to force the 2 components - bicycle bottom bracket shell and crank - to fit). Metal alloy housings requires:
Designed to place C-Bear ceramic bearings next to the crankarm for optimal stiffness and maximum power transfer.
Eliminate unecessary add-ons