Features: High collocation provide smooth shifting experiences and improves cycling efficiency. Consist of light weight aluminum alloys component, Suitable for cycling enthusiasts and professional racers who love cycling. Suitable for various cycling environment such as mountain and highway. Excellent performances in complex terrain, fashion appearances and rusts resistance. Specifications: Color:Four Elections Dimension:50×8.5mm/1.97×0.33in Component:Aluminum Alloys Package Includes: 1pc Bicycles Ceramics Bearing Jockeys Wheel note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.