Kogel Wheel Bearings Cross / 6806 (30x42x7mm)Designed and built to reach faster speeds with less effort and offer exceptional durability in real world conditions, the Kogel Wheel Bearings are the ultimate performance upgrade. Made from ceramic ball bearings, rather than steel, they combine high durability with low friction for a smoother ride, increased speed and improved handling. All of this results from their use of ultra low rolling resistance, ceramic balls on high grade stainless steel