For inner and outer road 7075/T6 aluminum Precision CNC machined ramps and stainless steel pins Black anodized color with laser etched logo. 110 and 130mm bcd. Compact cranksets use a 110 BCD chainring. FSA Pro Team Issue, Superlight and K-Force cranksets as well as Shimano cranksets use a 130 BCD chainring. Campagnolo cranksets use a 135 BCD chainring.