Optimise your wheels with CeramicSpeed Hub Bearings to benefit from reduced friction and increased performance. The result is higher speed with the same effort as well as a higher top speed. CeramicSpeed Wheel Bearings have a proven lifetime, which is 3-5 times longer than standard bearings. When upgrading with the special CeramicSpeed Coated Bearings, the lifetime will be further prolonged.All components are optimised for low friction and prolonged lifetime.In The Box28 x 5/32" ceramic balls5ml syringe of CeramicSpeed AllRound GreaseSticker sheetCompatability: See CeramicSpeed compatibility chart for Shimano