... Gr2,Gr5(6Al4V),Aluminum 7075-T6,6061-T6 Spec: 10t 11T 12tTreatments: Polished,AnodizingTitanium Ti Jockey Wheel for Rear Derailleur ... Pulley 10t 11T 12tMaterials: Titanium Gr2,Gr5(6Al4V),Aluminum 7075-T6, ... 6061-T6Spec: 10t 11T 12t Treatments: Polished,Anodizing(Blue,Gold,Red,Black green ...