Durable & smooth front 105 hub Radial lacing compatible Cubic Boron Nitride treated cone races provide a mirror-smooth bearing surface for a low friction, corrosion-free performance Labyrinth & low-friction contact sealing effectively shuts out water & dirt without affecting rotational smoothness Internal O-rings help maintain & increase service life of front hub by holding the grease in the bearing housing Anodised cold forged aluminium hub shell Comes complete with Q/R skewer