JC,
It’s difficult to tell for sure what the metal is, based on the X-ray. If you compare the density of the hook hanger of the floating Rapala and the shot in the suspending baits they look the same. The hook hangers are a steel wire so the shot could be steel, lead, brass or other metals. Some on the shot are hollow beads and some may be less dense metal such as aluminum or even plastics. If you look in the head of the Pointer (#10) you see some beads that are considerably less dense that the rest. If you own a Pointer that is translucent, look and see if you can tell what it is. I believe that most the plastic crankbaits have similar hook hangers. The new materials and sonic welding make them very strong.