Features 1、Smooth and Quiet Operation: Experience smooth and noise free rotation with the accurate internal thread, ensuring a seamless connection with the bicycle hub for an excellent cycling experience. 2、Lightweight Design: The hollow construction reduces weight and enhances balance, making it easier to ride without compromising strength. Easy installation and use, making it an ideal choice for reducing bike weight. 3、Durable Construction: Crafted from high strength steel, the flywheel is resistant to rust and built to withstand long lasting use. 4、Convenient Installation and Usage: Designed for effortless installation and user friendly operation, suitable for riders of all skill levels. 5、Accurate and Reliable Gear Shifting: The 12 speed flywheel ensures accurate gear shifting, providing a smooth and stable cycling performance. Item Type: Bike cassette Material: Steel Weight: Approx. 312g / 11oz Package List 1 x Bike Cassette 1 x Accessory