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This is a pretty cool piece of kit here.  There are 3 layers of metal being used here: Ti, Scandium, and 7075 Aluminum. The metals are utilized appropriately in in terms of material strength. These bad boys are supposed to shift as well and ride as smoothly as Dura Ace cassettes.  Personally, I’ve never had any issues with my Recon full 7075 cassette and I do like the almost 30 grams of weight saved compared to this KCNC cassette but if you’re a heavier or more powerful rider this makes a lot more sense.