Yes the leadhead is molded inside, and yes they are "disposable" swimbaits. Having said that I've found some of them still good. Some of them are very realistic looking, others you wonder what they were smoking. I've tried 3 paccks with 1 doing great on bass and sqawfish and the other 2 needing help or Circular filing. The Saltwater sized ones seem to plane-out to easy when I want to speed up.

Tight lines,
Wade