In every bearing, CeramicSpeed uses Grade 3 silicon nitride balls that possess the best possible surface finish and roundness, ensuring not only reduced friction when paired with hardened steel rolling tracks, but also unparalleled bearing longevity. When developing bearings for extreme performance combined with exceptional longevity, it is essential that the ceramic balls have exceptional finishing quality. Thanks to their high quality, CeramicSpeed Balls are 400% smoother, 128% harder, and 58% lighter than traditional steel balls, typically used in bicycle components.