DescriptionModel Number : for shimano sramTotal Capacity : 11T-18TGears : 11 SpeedMaterial : AluminumType : Rear DerailleurOrigin : Mainland ChinaComponents : DerailleursRegarding the color of the guide wheel, because of different batches and different monitors, the color of the picture you see may be different from the actual color. If you are concerned about the color of the guide wheel, please refer to the videoMTB Bicycle Rear Derailleur Jockey Wheel Ceramic bearing Pulley AL7075 CNC Road Bike Guide Roller Idler 4mm 5mm 6mmName: Rear derailleur guide wheelMaterial: Aluminum alloyBearing ball: ceramicColors: ColorfulFeatures: Ceramic bearings are sturdy and lightweight, super-lubricated. bicycle rear derailleur. Using high-strength aluminum alloys, processed by CNC, lightweight and durable.Essential accessories for your bike.Packaging includes:Fit for 4/5/6 MM roller screw axisApply for most of rear derailleur on the market, support 7/8/9/10/11 speedTips: Please choose the same size with the original pulley. If no totally same, choose the smaller type, never choose the bigger than original ones.