They'll last a long time. A-zooms are good. There are others that appear more fancy and I don't know the exact longevity of them. After awhile they'll get beat up and scratched, but who cares. These are functional training aids, nothing more. Let's just say they are a good investment for dry firing and for practice in general. But even with snap caps, remember: empty gun is still always treated as loaded and go from there.