HIGH-QUALITY MATERIALS: Made of high-quality galvanized head and steel wire, strong smooth cable for smooth LENGTH IS SUFFICIENT: Long enough to adjust the length of the cable. You can cut the cable shorter if it is too long ADJUST SPEED: Can help you adjust the Speedwell SYSTEM COMPATIBILITY: Suitable for speed control system of mountain bike, a racing bike or folding bike, etc LARGE APPLICATIONS: Suitable for most types of bicycles, such as the usual bicycles, mountain bikes, city bikes, etc