E*Thirteen Components TRS+ 11s cassette 9-44T super wide tooth range, top quality made with great shifting performance and reliability. Unique 3 piece assembly, first 8 cogs are made in heat-treated cromoly steel for a long lasting, bigger 3 cogs are fully CNC aluminum made for lightweight. High wear parts are available individually. Black hard anodized finisghing. 330 gr weight (lockring included), compatible with Shimano or Sram 11 speed system both but only with XD freewheel.