Durable & smooth 9- & 10-speed compatible 105 rear hub Cubic Boron Nitride treated cone races provide a mirror-smooth bearing surface for low friction&44; corrosion-free performance Labyrinth & low-friction contact sealing effectively shuts out water & muck without affecting rotational smoothness Internal grease sleeve help maintain & increase service life of hub by holding the grease in the bearing housing Silver anodised cold forged aluminium hub shell Comescomplete with Q/R skewer 8&44; 9 & 10-speed compatible