Features: Craft from quality aluminum alloy materials, this derailleur pulley is light weight, ensuring long timing use and resistance to wear and tear. Enhances your cycling performances with our 11T rear derailleur pulley, designs to provide smooth and efficient gear shifting for any biking adventure. Upgrading your bicycles drivetrain systems with this essential component, ensuring great performances and a wonderful cycling experience. Perfect for various cycling scenario, whether you're tackling rough mountain trail or cruising through city landscapes. Great for cycling enthusiasts and professional bikers who demand precisions and reliability in their bike component. Specifications: Materials: Aluminum Alloy Color Optional: 7 Color is Available as Shown in the Picture. Package Weight: approx.15g Diameter: approx.43.6mm/1.72in (More Size Detail, Please See Picture.) Package Includes: 1Pc Bike Rear Derailleur Pulley Wheel note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!