A. This bicycle cable and core kit is a good choice for various types of bicycles! It includes universal gear cables and brake cables in multiple specifications to meet different needs. B. The universal gear cables and brake cables in the kit are suitable for mountain bikes and road bikes. Among them, the brake cables use a mechanical braking method, providing stable and reliable braking performance for cycling and making cycling safer. C. Whether you're cycling on rough mountain roads or cruising on flat city streets, this kit can fit well. One set can meet your various needs, so you don't have to worry about the matching issues of different cables and cores. D. It brings great convenience to the upgrade or maintenance of your bicycle, allowing you to easily enjoy the fun of cycling and start a wonderful cycling journey!