Ceramic bearing, good lubrication performance, CNC milling, polishing and grinding, anodizing, light weight skeleton design.Additional feeding reducer, more compatible, suitable for 4/5/6mm axis rear dial, flexible rotation.CNC machined from 7075 high strength aluminum alloy, diamond knife finishing, good appearance and wear resistance.Adopt ceramic bearing, which greatly reduces the friction, higher strength and better riding experience.New design of clip spring, no chain jamming when riding, suitable for 8, 9, 10, 11 speed rear derailleur, the outer diameter of mounting shaft is compatible with 4, 5, 6mm.Adopt snap spring fixed structure, compatible with guide link and tension wheel.Deep tooth guide wheel, can effectively reduce chain drop, more sensitive shifting and more stable winding.Name: Bicycle Ceramic Rear DerailleurProcess: CNC Milling, AnodizingSpecification: 11TColour:MulticolorMaterial:Aluminum alloy + ceramicSize:Diameter: About 40mmWeight: About 7gPackage Contents:1 x bike Rear Derailleur2 x ReducerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.