These Centaur cranksets are anodized alloy with contemporary graphics applied to the outside of the crankarms. The chainrings are in stadard 39/53t or Compact 34/50t config. The spacing of the rings are for 10 speed Campy drivetrains only. The bottom bracket assembly is Campagnolo's own Power Torque system. It's operation is flawless and installation is a snap, but keep in mind, it is not compatible with Ultra Torque.