Bones Swiss Ceramics redefine what a bearing can do. This cutting-edge material is lighter, harder, stronger, waterproof, and offers unbeatable longevity. Plus, made in Switzerland for the highest level of precision and craftsmanship. Features include improved acceleration, increased roll speed & distance, greater protection against dirt & moisture, enhanced protection of races, quick & easy cleaning, nylon ball retainer, and Skate Rated™ clearance for the utmost performance & durability.