Features 1、Aluminum Alloy Material: All aluminum alloy material, strong and impact resistant, riding more assured, the surface layer is anodized, effectively protecting the aluminum alloy body, anti corrosion and anti oxidation. 2、Wear Resistance Bearing: The force is not easy to change shape, cold resistance, high temperature resistance, wear resistance and corrosion resistance, high transmission efficiency, and more labor saving riding. 3、Positive and Negative Tooth: Bicycle rear derailleur pulley can reduce the lateral virtual position, which can shorten the shifting response time and improve the shifting performance to a certain extent. 4、Deep Toothed Guide Wheel: The deep toothed guide wheel optimizes the inclined tooth profile and synchronizes with the chain transmission direction, making the chain entry and de chaining smoother. 5、Good Workmanship: CNC machined and finished with a knife, the appearance of the product has a good wear resistance index. Bike rear derailleur pulley fits for bike of 12T and 8, 9, 10, 11 speed. Item Type: Bike Rear Derailleur Pulley Product Material: Aluminum Alloy Product Style: 12T Product Application: 8/9/10/11 Speed Weight: Approx. 15g / 0.5oz Package List 1 x Rear Derailleur Pulley 2 x Reducing Sleeve Tube