Compatible :Sram XD
Specification:
12s 9-50T Black : 9-11-13-15-18-22-24-28-32-36-42-50 about 537g
12s 10-52T Black : 10-12-14-16-18-21-24-28-32-36-42-52T about 545g
1-11 teeth Ultra high strength steel, hardness 680HV 12 teeth 7075 aluminum alloy, hardness 170HV