... 12t Treatments: Polished,Anodizing Ti Titanium Rear Derailleur Pulley For SHIMANO & SRAMMaterials: Titanium Gr2,Gr5(6Al4V),Aluminum 7075-T6,6061-T6 ... Spec: 10t 11T 12tApplications:SHIMANO & SRAMTreatments: Polished,AnodizingTitanium Ti Jockey Wheel for Rear Derailleur Pulley ...