Absolute Black Cannondale Direct Oval N/W Chainring Absoluteblack Oval Cdale Hg 30t BkThe lightest, most refined solution for Cannondale Hollowgram cranks, periodHollowgram spiderless chainrings allow for a flawless 1x9/10/11 drivetrain setup5.7mm offset providing better chainring than other brands. Compatible with Cannondale Hollowgram Si, SiSL, SiSL2 and the latest F-SiNarrow/Wide tooth profile helps prevent dropped chains. Oval construction maximizes pedal travel and torque transfer7075 Aluminum ConstructionHollowgram30TNarrow/Wide7075ALBlack