Before I purchased my new leather cover I did get a slight mark with using the included black leather/plastic case. The copper is way soft as far as case material goes. But I’m not complaining, I would still love my 1Z even if it was covered with porcupine quills. There are all styles of covers, so individual mistakes causing dings would vary. I’m sure there are cases that completely protect the 1Z. Even aluminum IEMs dropping unexpectedly from 10 inches onto the actual DAP 1Z case will create a small ding.