Cannondale Mountain Hollowgram SiSL2, Hollowgram Si, and Cannondale Si crank spindle spacer set. Kit includesNon drive 19mmNon drive 14mmNon drive 10mmNon drive 7.5mmNon drive 2.5mmDrive side 14.1mmDrive side 9.1mmDrive side 5.1mmTwo bearing shieldsOne BB30 shimSee diagram for proper spacer sizes for your bike.