• Compatible with SHIMANO, SRAM and all other brands of MTB variable-speed systems. Incompatible with Shimano SLX, Micro Splin; Sram XD, XDR, GX, X01, XX1
• Compatible with HG, incompatible with XD, MS
• [Specification]: High quality 12-speed cassette, 11x50t Cogs: 11-13-15-17-19-21-24-28-32-36-42-50T
• [Weight]: 12speed11-50t (about 600g); 12speed11-52t (about 680g), suitable for all kinds of mountain bicycles
• [Cog Material]: Nickle-plated High Strength Steel; high-quality material improves the hardness and wear resistance of the flywheel, super anti-rust, All-round protection electroplating layer, adapt to harsh weather, Whether it's road climbing, wading, snowy wet Mud or Heavy Rainfall
• [Carrier Material]: Ultra-Light Aluminum Alloy, and Hollow Design Is Perfectly Combined, Reduce Bicycle Weight, Make Riding Easier

Don't know whether you should choose Aluminum Cassette/Steel Cassette or Freewheel? Read  before purchasing>>