The combination between the best ceramic ball grade and the production process of the balls, ensures that the CeramicSpeed Balls are 15% harder, 100% smoother and take 99% higher loads than other ceramic balls typically used within the bike industry. The CeramicSpeed Balls feature unparalleled impact strength, smoothness, roundness and brittleness, proven to be superior to both ceramic and steel balls. Every CeramicSpeed Ball is Grade 3 Silicon Nitride, the best grade a ceramic ball could be given. This is key to achieving the lowest friction and maximum longevity.