This mountain bike rear derailleur offers ease of use and maintenance. It's suitable for a variety of bicycles, including mountain bikes, road bikes, and folding bicycles. Constructed from robust plastic steel, it ensures durability and delivers stable, sensitive gear shifting performance. Features: The robust plastic steel material combined with superior shifting performance guarantees a safe and stable ride. Precise gears deliver light and stable shifting performance, simplifying your ride and enhancing comfort. This bike rear derailleur is designed for 7/8/9 speed shifting drivetrains. It's suitable for mountain bikes and road bikes, making it a valuable accessory for your cycling journey. The direct mounting design facilitates easy installation and maintenance. Specifications: Material: Plastic steel, steel, PA nylon Total length: 15cm/ 5.9in Weight: 254g/ 9oz Package List: 1 * rear derailleur