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Various grades of steel offer better hardness, rust resistance etc. Bearings with ceramic balls (and races) have been available since the late 1990s, They are lighter and longer lasting, however significantly more expensive. Black silicon nitride ceramic is superior to white zirconium dioxide ceramic, since it is considerably harder and tougher. At the modest rotational speeds encountered in skates, manufacturer data suggests negligible difference in friction performance between the various bearing materials. At these speeds, ball bearing friction tends to be dominated by seals and lubricants.