Product name:Bicycle Chain guide Product size about : 7*6.8cm/2.7*2.6in Product color: As shown in the figure Weight: about 45 g Product material:nylon+ABS product features: 1.Effective chain protection: The chain guide can protect the chain from falling off and avoid chain interference when riding perfectly. Effectively prevent the chain from falling off and skipping the chain.Suitable for single chainring 8-12 speed, suitable seat tube diameter: 32~35mm 2.Necessary tool for bicycles: Used for single-piece flywheel, driving more smoothly. Fits bikes with 1x drive system for one-piece sprockets. Bicycle accessories are useful tools for bicycle owners to improve their bicycles. 3.Easy to Install: Our chain guides are easy to install. No need to disassemble the crank, just adjust it with a wrench. 4.Premium Material]: The mtb chain guide is made of high quality strong nylon material, which is light and Sturdy. High-strength material, wear-resistant and deformation-resistant.Not easy to fade: The surface of the chain guide is black and not easy to fade. Simple and stylish, black is very resistant to dirt, suitable for matching bicycles of various colors. 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 Bicycle Chain guide