- Steel construction on all but the largest aluminum gear - 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-speed 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