1. This bicycle cable housing is designed for mountain bikes, road bikes, folding bikes, etc. It comes in two sizes, 4mm and 5mm, and can be adapted to the shifting and braking systems of different bike models. 2. The cable housing is made of relatively good materials, with decent quality and relatively high durability. It is 3 meters long and comes in a bag, which can meet the daily use and replacement needs to a certain extent. 3. It has a wide range of uses. It can be used as a shifting cable housing to accurately transmit shifting instructions, making gear - shifting smoother and ensuring easy switching between different gears during cycling. It can also be used as a braking cable housing to effectively improve the sensitivity and reliability of the brakes, providing strong support for cycling safety. Whether speeding on flat roads or navigating through rugged mountains, it can perform stably and is a good accessory choice for bicycle enthusiasts. 4. It has achieved considerable sales in regions such as Europe, South America, Southeast Asia, North America, and Northeast Asia, and its quality has been widely recognized.