Durability is very low - Strike Industries Aluminum 9mm Dummy Rounds

These worked well but were not very durable. I used them for 1.5 months and almost all of the blue coating has worn off and the case head is chewed up from extractions. The rounds will also leave debris in your firearm after extended use. You can buy much better quality brass snap caps that are also realistic weight for this price. These aren't worth the money in my opinion.