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LBT full Ceramic bearings are as friction free as is possible with today's radial bearing technology. The races and balls are made from Zirconia so they can be run completely dry without any need for grease or oil. The Boca Bearing's line of LBT Full Ceramic bicycle bearings come with non-contact PTFE seals and a light-weight PTFE retainer. If performance is what you are after then full ceramic bearings are your solution.