The Asos metal collar tips are one big disappointment.
One of them was already slightly damaged when they came in, underneath the smooth surface it looked like it was oxidized from within. After a few days the oxidation spread and the collar tip is now covered with black stains. The other one that seemed to be okay, just broke in two for no reason at all. You can't expect high quality from Asos accessories, but I did expect to be able to wear these more than twice.