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Unlike other, inexpensive, hub replacements on the market the Centric hubs are OEM grade and feature made in Japan NTN bearings. Don't be fooled by "economy" bearings or "economy" hubs on the market which often fail prematurely.
Hubs ship with ABS rings pre-installed, if you are installing these hubs into a non-ABS car you can either leave the ring installed or remove it. Don't forget ARP extended wheel studs if you plan on running a spacer more than 3mm.