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Peekaboo5, Ceramic hybrid Motorcycle Wheel Bearing Kits are specially designed for off-road or excessively dirty operating environments. Peekaboo5 bearings have high precision, grade 5, silicon nitride ceramic balls, extra hard chrome steel races, Boca’s exclusive Ultra dry Lube (UDL) coating, ABEC 5 tolerance races, a high speed Peek retainer, low friction rubber seals and Boca's exclusive low friction grease. Ceramic hybrids are lighter, have less rolling resistance and can sustain higher operating temperatures than traditional bearings. Bearings that are packed in grease will require a short break in period to loosen up. Please contact Boca Bearings directly before installing ceramic bearings in a motorcycle engine.