Campagnolo HB-RE023 hub bearing. Fits all Campagnolo and Fulcrum hubs/wheels that use the oversize alloy axle (17mm) and have cup and cone bearings from about 1999 onwards.
Fits all Campagnolo front rim brake zonda wheels, and fulcrum racing 3 and 1 wheels until 2017.
Fits all Campagnolo zonda, eurus and neutron rear rim brake wheels till present.
Fits all Fulcrum racing 3 and 1 rear wheels till present
The bearing are used in Zonda disc brake front and rear wheels and can be used in shamal and bora disc brake wheels too. This is the steel bearing set (not for USB or CULT hubs).