All I know about these darts is that they are 16 grams, a coated brass, and that they were probably intended for soft tip play. I know they are brass for two reasons: first, the size to weight ratio rules out any denser metal. Also, inside the 2ba stem hole you can see that the raw metal is brass colored.
Wearing hammerhead points the darts are quite a nice addition to my collection. They fly well as configured and the grip is not overly aggressive. I have posted these darts to dartnutz.net's UFO section hoping someone can identify them.