Features: 1. Made of high-quality material, durable and sturdy, anti-scratch and wear-resistant. 2. The wide link design increases rigidity and using time. The 11-teeth pulleys can reduce chain noise and improve efficiency. 3. Easy to install and remove, convenient to use. 4. Suitable for mountain bikes, road bikes, cycling bikes and more. Specifications: Largest Sprocket: 34 Teeth Total Capacity: 45 Teeth Maximum Difference of Sprocket: 22 Teeth Derailleur Action: Top (Traditional) Package Included: 1Pc x Rear Derailleur .