The SRAM XG-1190 is still the most advanced cassette ever made. Its super light, deadly silent and delivers an undeniable performance advantage. The nine cogs in the cog cluster are machined from a single block of high grade tool steel, increasing stiffness while weighing even less than a titanium cassette. Between each cog is a StealthRing elastomer to reduce vibration and noise. Cutouts on the rear cog further reduce weight and add stiffness. Its the final piece in the drivetrain puzzle, and it delivers ultra-fast, ultra-quiet shifts that will always put you in the right gear.FeaturesHollow steel dome makes for the stiffest gear cluster ever at the lightest weightCompatible with SRAM RED eTap, RED, Force, ApexHeat-treated, high-grade tool steel provides superlative durability and a beautiful finish.StealthRing elastomers and advanced tooth profiles eliminate vibration and noise for a smooth, silent ride.Aluminum cog: lighter, stiffer, stronger due to the design, material and production process.SpecificationsColor: SilverMaterial: Steel/Aluminum CogsSpeeds: 11-SpeedGear Range: 11-25TGears: 11,12,13,14,15,16,17,19,21,23,25Cassette Mount: SRAM/Shimano 10/11-SpeedWeight: 151gNew, Never Used, OEM, This item is exactly as pictured and does not include retail packaging.SRAM