Riedell kwik ceramic skate bearings pack of 16quite simply kwik ceramic bearings are the most advanced ceramic bearings availablekwik ceramic bearings are made using ceramic ball bearings which accelerate faster and roll further than their steel counterparts and have a higher resistance to dirt moisture and also have a higher chemical resistance titanium nitride hardens and strengthens the surfaces that it is applied to giving a life expectancy of three or more times longer versus bearing