The Shimano CN-HG93 9-Speed Super Narrow Chain chain features precise construction and improved durability for 9-speed road/mountain drivetrains. It is only 299g, which reduces the rotational weight significantly, especially compared it competing chains. It is Zinc-Alloy Plated with Shimano HyperGlide Technology. The distinctively designed Hyperglide chains and cassettes incorporate specially positioned shift ramps, tooth profiles, and chain widths for improved chain control during shifting. Fast and responsive indexed shifting is the result.