Three alloy carriers & five titanium sprockets make the Shimano XTR M980 10 Speed Cassette Shimano's lightest MTB cassette yet. Hyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load. Close ratio gearing allows a more efficient use of energy through finer cadence control. Three separate lightweight alloy carriers reduce weight & increases stiffness giving more precise, faster shifting. The five largest sprockets are made from titanium to reduce weight without sacrificing strength. The sprockets are cut away extensively & drilled to further reduce weight without reducing rigidity. Nickel-plated finish offers hard wearing resistance to corrosion, & cassette comes complete with an alloy lockring. Compatible with 10 speed HG-X MTB chain.