- Four carbon carriers and six titanium cogs for reduced weight - Nickel-plated finish for corrosion and wear resistance - Dyna-sys 11-speed cassette with "Rhythm step" gearing for closer gear ratios and smoother shifting performance - Fits Dyna-sys 11 and current Shimano 9/10-Speed MTB hubs - The largest cog (40t) is positioned inboard and above the drive-side flange - Hubs with tall drive-side flanges may not be compatible due to spoke interference - Range: 11-40