1. This folding bike chain stabilizer is suitable for the folding bike BYA412. It is designed with an elliptical sprocket modification and is a practical chain zipper. It can effectively stabilize the chain, improve the smoothness and stability of riding, and make your riding more worry - free. 2. Its material is aluminum alloy, which is light, strong and durable. It won't add too much burden to the vehicle and can withstand a certain degree of external force impact, thus extending its service life. 3. In terms of specifications, there is an 11T idler wheel available for selection, which can meet the diverse needs of different users. Whether you are commuting daily or participating in competitive cycling that pursues speed, you can find a suitable specification. 4. This chain stabilizer has strong adaptability and can fit the folding bike BYA412 well, bringing you a better riding experience.