The top-of-the-line Shimano Dura-Ace R9200 12-Speed Cassette features titanium for the five largest sprockets, paired with carbon and aluminum carriers for increased rigidity and reduced weight. The remaining seven smaller sprockets are made from steel, chamfered, and drilled to minimize weight while maintaining strength. With 12 sprockets, this cassette offers more gear ratios with closer spacing, helping riders find their ideal cadence easily. The Hyperglide+ tooth profiles and contoured shift gates significantly enhance shifting speed and smoothness, even under heavy load. Nickel-plating on the sprockets boosts durability, completing this high-performance design. Features: Super lightweight 12speed HG+ cassette with a rigid carbon and alloy carrier for excellent shifting even under the most demanding gear changes 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 Largest sprockets are mounted on lightweight alloy and carbon carriers to reduce weight and increase rigidity 5 largest sprockets are made from titanium to reduce weight without sacrificing strength Sprockets are extensively cut away and drilled to further reduce weight without reducing rigidity Nickel-plated finish offers hard wearing resistance to corrosion Alloy cassette lockring For Super Narrow 12-speed chains