... 12t Treatments: Polished,Anodizing Bike Bicycle Al Aluminum Rear Derailleur Pulley 12TMaterials: Titanium Gr2,Gr5(6Al4V),Aluminum 7075-T6,6061-T6 Spec: 10t ... Treatments: Polished,AnodizingTitanium Ti Jockey Wheel for Rear Derailleur Pulley 11TMaterials: Titanium Gr2,Gr5(6Al4V),Aluminum 7075-T6,6061-T6Spec: 10t 11T ...