Centaur 10s Black 39/53 170 Forged aluminum crankarms plus chainrings with Micro Precision Shifting (MPS) in light alloy with anti-friction treatment 8 pin large chainring for faster upshifts Integrated PowerTorque axle sytem requires PowerTorque cups (not included) 738 gramsItem SpecificationsColor: blackSize: 170UPC: 8004995861105MPN: FC12-CE093Sold Individually