Bicycle Derailleur Pulley, Aluminum Alloy Rear Derailleur Pulley Jockey Wheel for Mountain Bike Bicycle Replacement PartRoad Bike Rear Derailleur Pulley Bike Jockey Wheel Pulley Ceramic Guide Roller Part for Mountain Bike Modification PartsDescription:brand new and high qualityFeatures:11 T size with bearings structure.Setting for 4/5/6mm spindle shaft rollers.Apply for most rear derailleur in the market, support 7/8/9/10 speed.Transmission for a bicycle, ceramic bearing for ultra durability.Specification:Type: Bike Jockey Wheel Material: Aluminum alloy 7075Dimension: app.4.3x0.6cm/1.69x0.23inColor: Silver, Blue, Black (optional)Quantity: 1 PcNote: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Includes:1 Pc x Bike Jockey Wheel