This cassette features a rock-solid steel construction, which makes it perfect at handling all the knocks and bumps that are associated with long distance journeys. Whether you're using it on a mountain bike or road bike, this model's HyperGlide sprockets allow you to benefit from smooth and improved chain control during shifting. Technologies: HyperGlide Sprockets: The distinctively designed HYPERGLIDE sprockets incorporate specially positioned shift ramps and tooth profiles for improved chain control during shifting. Fast and responsive indexed shifting is the result. The HG cassette sprocket, which was developed for the MTB 7 speed system, underwent comprehensive optimization to achieve super-highly efficient shifting. HG sprockets: Guide the chain quickly and directly to the next sprocket without override. Conventional sprockets: Cause the chain to ride up and over the gear teeth before engaging the sprocket.