• 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
• [Material]: High strength steel, Nickel-plated finish offers hard wearing resistance to corrosion/Ultra-Light Aluminum Alloy
• [Detail]: High precision internal thread ensures close connection with bicycle hub. Smooth rotation and easy maintenance. Hollowing technology to further reduce weight without reducing rigidity,make riding lighter.

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