FULL CERAMIC balls, STAINLESS STEEL casing = THE ULTIMATE IN CORROSION-FREE BEARINGS. Evolving from our stainless steel all-weather bearings, this offers the highest level in the evolutionary chain of skateboard technology. The all-weather CERAMIC STAINLESS STEEL is rust free and the ultimate bearings for skaters who like to skate in all-weather conditions but also have the lowest co-efficient of friction available in skateboarding today.