They are clearly stamped from the copper sheet, therefore the removed edges may be sharp and have a slight edge. While this is easy to fix with a flat file, not everyone will have a file or be willing to bother. Dimensions are not listed so you should have a caliper to measure as well. Because of these additional requirements, I cannot give 5 stars. It's somewhere between 3 and 4, but since the base metal thickness is so high, I only deducted one star.