Dear，Pls leave a massage to tell us what design (Color) do you want.thank you.

Brand name: mi.ximStructure: ceramic bearingMaterials: 7005 high strength aluminum alloySpecification: guide screw for 4/5/6MM axisSize: 11T.42 mm in diam.Weight: 7 g.Uses: For most of the rear derailleur， support 7/8/9/10 speed!Guide the selection principle:1: try to use the same way as the original guide wheel size， not the same， you can choose more than the original guide wheel small， cannot. choose large.The 2: guide wheel and the tension wheel does not distinguish， but is not the same dial the original guide wheel and the tension wheel size some， can be changed， but the chain need to re adjust the length.