The Shimano 7900 rear hub features a titanium freehub body compatible with Shimano 10, 9, and 8 speed as well as SRAM 10 speed. It has an updated design with an added no-tool "digital click" bearing adjustment nob. A well-sealed, traditional ball bearing design means it is full serviceable. Anyone who has serviced Dura-Ace hubs has likely found the grease good as new because the seals are so effective. The hub has an oversize aluminum axle for stiffness and light weight. Includes a Dura-Ace skewer.
I had Excel build a set of wheels for me using these hubs. They are super smooth and super bullet proof. Perfect when you want to rely on something on long trips in far away places. Great hubs and Excel does great wheel builds. Good job.