The Shimano 105 Rear Hub is a 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 sleeves help maintain & increase service life of hub by holding the grease in the bearing housing. Comes complete with quick release skewer.