Industry Nine Hydra Classic mountain hubs are loaded with features every rider will appreciate such as revolutionary 0.52deg engagement generously low weights and an intuitive layout that can be serviced without any proprietary tools.From turning and milling bar stock 7075-T6 aluminum for shells axles and encaps wire EDM cutting A2 tool steel for pawls and driverings to in-house anodization lab every step of design engineering manufacturing and assembly is done to exacting standards in Asheville NC690 P.O.E. Hydra Freehub body engages every .52 degrees yeilding telepathic controlClassic j-bend spoke interfaceSteel cartridge bearings are durableEasily serviced with no proprietary tools; Designed to keep you in the saddle and out of the service queue