Shimano M6100 Deore 12 Speed CassetteWhether you're exploring the mountains with your friends or shredding the trails on your own, this cassette is designed for fast and smooth performance. It features Hyperglide sprockets, which have a computer designed tooth configuration with contoured shift gates. This results in a crisp and smooth shift even under load. In addition, its close ratio gearing allows for a more efficient use of energy through finer cadence control. This model's sprockets are also cut away and drilled to reduce weight without reducing rigidity.Features:Material: Alloy Use: MTB Ratio: 10-51T Sprockets: Hyperglide Compatibility: For use with 12 speed MTB chains Speed: 12 speed Part Number: CSM6100051 Weight: 534g (approx)Technologies: Hyperglide Sprockets: Hyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load. Close Ratio Gearing: Close ratio gearing allows a more efficient use of energy through finer cadence control. Sprockets are cut away and drilled to reduce weight without reducing rigidity. A 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.