This is the Fhb Dt My13 Roval Star Ratchet Style Freehub Body For 350 Hubs - Blk (Hwrabl00s3220s). Shimano HG-style body works for all 9 and 10 speed HG cassettes and 11-speed HG mountain cassettes. This is compatible with the following bikes: Specialized Alias Specialized Allez Specialized Amira Specialized Camber Fsr Specialized Enduro Fsr Specialized Epic Fsr Specialized Fate Specialized Roubaix Specialized Ruby Specialized Safire Fsr Specialized Sj Fsr Specialized Sj Ht Specialized Tarmac Specialized Venge