Shape Oval Offset Type BOOST or Standard Model 26T or 28T or 30T or 32T or 34T or 36T Offset, mm 3mm (BOOST), 6mm (Standard) Made from 7075-T651 Aluminum Alloy Surface coating Anodizing Made with CNC milling Compatible cranksets Cannondale Hollowgram Si/Si 2016, SiSl2 or Garbaruk XC Crankset Chainline, mm 52mm (BOOST), 49mm (Standard) Chain compatibility Compatible with all 9,10,11-speed chains, 12-speed SRAM Eagle and T-Type, KMC, Shimano HG+ chains. Color Black or Blue or Gold or Green or Orange or Red or Silver or Violet