12-speed wide range MTB cassette 7075 aluminum 42t and 50t cogs Alloy spiders, locking and spacers Not compatible with XD or Shimano freehubs Requires the use of Sunrace HBMX98, X92.R or X90.R hubs 10-50t 12sp 10,12,14,16,18,21,24,28,32,36,42,50 Silver 579g