Product name:11T metal transmission guide wheelSize:11TWeight: 11T about 11.5 gramsProduct color: As shown in the figureProduct material:Aluminum alloyproduct features:Suitable for 4/5/6MM roller screw shaft. Suitable for most rear derailleurs on the market. The picture of the selection options is for color reference only. The specific number of teeth is based on the 11T/13T you selected when placing the order. Suitable for all riding applications, whether road, mountain biking or triathlon, these pulleys will optimize your rear derailleur speed, reduce friction and extend life. As the fastest spinning bearings on your bike, upgrading our high-performance pulleys is an effective way to save energy or ride faster.Precautions:1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images.2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only.Shipment includes:1 pc 11T metal transmission guide wheel