Shimano CS-M9001 XTR HG 11sp Cassette

Four carbon carriers and six titanium cogs for reduced weight
Nickel-plated finish for corrosion and wear resistance
Dyna-sys11 cassette with "Rhythm step" gearing for closer gear ratios and smoother shifting performance
11-13-15-17-19-21-24-27-31-35-40 tooth cogs
Fits Dyna-sys11 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
Optimized for use with 1x, 2x and 3x drivetrains