New Shimano CS5800
New Shimano CS 5800
Not sure that I see any wear. The pics above are my new spare that I just pulled out of the box. All I see in your pics is the normal profiling and shaping of the teeth which is alarming to those that don't realize how drastic Shimano and others get with individually profiling almost every tooth.
However the finish quality of the sprockets doesn't quite look like shimano. Are you certain that's a shimano cassette in your pics?