These are minnow shaped heads. The head shape causes these jigs to have somewhat of an erratic action on free fall. The erratic action can cause the jigs to hang a little more in heavy cover.  These jigs can be customs tied with feathers, man made materials or tipped with soft plastic bodies.

This is a banana shaped head and most of these have a spinner, like the one shown.  These heads are just as effective being cast or vertically jigged.  The bottom spinner give an appealing flash.  Like most jigs, they can be custom tied or used with soft plastic bodies.

These are round shaped heads. Since the head is round, these jigs free fall very straight down and are the type most often used fishing heavy cover.  These jigs are customs tied with feathers, man made materials or tipped with soft plastic bodies.

These are cylinder shaped head and are used with soft plastic tube bodies.  The jig head is pushed inside the tube body and then the hook eye is push up through the plastic.