This is a new Ztto 11 speed 9-42 tooth cassette for use with an XD driver. If you’re unsure compatibility with your bike, message me. Great to replace your worn out sram Gx, Xo, or Xx cassette or use for current gen sram apex, rival, force , and red 1x11 dropbar groupsets. It would likely work fine with Shimano m5100, m6000,7000,8000 groupsets too if you’re getting a new real wheel that happens to be XD driver I bought this for one of my refurbished bikes, but the eBay seller from China sent this one instead of the HG driver one I ordered. As you can imagine, returning to china isn’t easy. Win some and lose some. This cassette is branded by a whole bunch of different names (sunshine, VG, Ztto) but they’re all the same one. They range in price on eBay between $70-$55. —>$40 firm<— I also do tech services so please message about tuneups. Guaranteed to beat local shop labor rates by 50% or more!