Plastic bottle of air at Goodwill in Phoenix.
Not sure how this catches fish.
I ACTUALLY KNOW ABOUT THIS
Under that red cap is a hypodermic needle. You jab the worms under the “collar” and inflate them. The weight on the fishing line drags down the worm, but the air inside keeps it from dragging on the bottom and being lost in the weeds along the bottom.
These are high end worm botherers, kids.