Features1Durable and Reliable: Constructed with metal, this mountain bike derailleur pulley ensures stability and durability for long term use. It can withstand various riding conditions and provide reliable performance. 2Designed for Mountain Bikes: Specifically designed for mountain bikes, this derailleur pulley offers precise guiding and chain tension adjustment, resulting in smoother and more efficient rides. 3Easy Installation: This derailleur pulley is easy to install, and it comes with clear instructions to guide you through the process. Even if you're a beginner, you can effortlessly assemble it on your bike and enjoy the benefits it brings. 4Improved Shifting Performance: With its optimized design, this derailleur pulley ensures precise and smooth shifting operations. 5Reduced Chain Wear: By reducing friction and wear, this derailleur pulley effectively prolongs the lifespan of your chain. It minimizes chain damage and reduces maintenance costs, saving you time in the long run.SpecificationItem Type:MountainBikesDerailleurPulleyWeight: 20g/0.71ozMaterial: MetalPackage List1 x DerailleurPulley