The new Shimano 105 R7000 cassette is a durable, lightweight option that offers smooth, precise and reliable shifting at a great price point.Fits HG 11-speed road freehubsAluminium spider armSteel lock ringMaterial: Sprockets: Steel, Nickel Plated; Spider: AluminiumFeaturing an aluminium spider arm, nickel plated steel cogs, and a steel lock ring, this Shimano cassette provides exceptional longevity, no matter what the conditions. Compatible with HG 11-speed road freehubs, and available in a number of gear variations, this is a great choice for riders who are looking for a great value 11-speed cassette.