I am guessing they were made as a blast from the past. Several states have apparently dropped their rule about barbed heads, including, Wisconsin. I know they were not legal before, I teach hunters ed and we taught that. But I sure don't see it stated in the newest version.
I bought some for my collection and they really do make it, as the late Lamont Grainger(footed shaft)stated. . . Now THAT'S what a hunting arrow should look like. Pretty neat.
Zwickey products have been good for longer than I have been on this earth, I expect no different from these.
ChuckC