Usage Tips:Describe: color as shown Name: Universal Chain Stabilizer Material: nylon plus fiber + plastic Weight: about 45.3 g Compatible: Fits bikes with 1x drive system for one-piece sprockets Specifications: 31.8-34.9MM/1.25- 1.37inch installation/E type installation 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. 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. [Easy to Install]: Our chain guides are easy to install. No need to disassemble the crank, just adjust it with a wrench. [Premium Material]: The mtb chain guide is made ofstrong nylon material, which is light and durable. 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. Notes: 1. As we all know, different computers display different colors, and the actual color may be slightly different from the picture below. 2. If you find it difficult to choose the size, you can contact me at any time, we will give you some suggestions, but only for your reference. 3. We can accept orders of mixed items, colors and sizes. This product includes: 1pc Bicycle Chain guide