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Peekaboo5, Ceramic hybrid bicycle bearing kits are specially designed for use with motorcycles, road/mountain bicycles and other demanding applications. 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.