Spec:Length6.5mm,8.5mm,9.1mm,10mm Treatments:Polished,Anodizing(Blue,Gold,Red,Black) Weight: 3.2g,3.3g,3.5g,3.7g Titanium Chainring chain ring nut BoltMaterials: Titanium Gr2,Gr5(6Al4V),Aluminum 7075-T6,6061-T6Spec:Length6.5mm,8.5mm,9.1mm,10mmTreatments:Polished,Anodizing(Blue,Gold,Red,Black)Weight: 3.2g,3.3g,3.5g,3.7g