Durable & smooth 9 & 10-speed compatible 105 rear hub Cubic Boron Nitride treated cone races provide a mirror-smooth bearing surface for low friction, corrosion-free performance Labyrinth & low-friction contact sealing effectively shuts out water & muck without affecting rotational smoothness Internal grease sleeve helps maintain & increase service life of hub by holding the grease in the bearing housing Black anodised cold forged aluminium hub shell Comes complete with Q/R skewer 8, 9 & 10-speed compatible