Features: 1. The anodized treatment makes it very rust resistant and oxidation resistant. And the deep tooth design allows it to have a tight fit with the chain. 2. Lightweight strong and durable and has good rust resistance which is very suitable for most bicycle enthusiasts. 3. This sealed jockey wheel can not only effectively reduce the resistance when riding but also improve the efficiency of riding which allow you to enjoy the riding process more comfortably. 4. These pulleys run on smooth ball bearings easy to use and install. 5. The jockey wheel is anti rust and corrosion resistant anodizeddurable to use and provide long service time. Notice: *Actual color may be slightly different from the image due to different Display and light effect *Please allow 1-3cm deviation due to manual measurement Description: Package Size: 90*70*10mm/ 120*90*10mm includes: 1 set x Rear Derailleur Pulley