CSMZ903 12sp Cassette, 11-51t - Black

- Lightweight wide-range mountain cassette compatible with HG 8-11sp freehub bodies\n- Fluid Drive Plus shift enhancing design\n- 7075 aluminum largest 3 cogs, all other cogs are steel\n- 7 cogs on 2 aluminum spiders, aluminum lockring and spacers\n- Compatible with Shimano 12-speed drivetrain