yea those are on jig hooks, and no i haven't had any problems, jigs are meant to ride parrallel in the current, and ur knot should sit straight up off the eye of the hook, the line should never get a chance to wrap up.
as you can see the dumbells are big ones, but they're not that heavy so i fish those with lighter gear. thats the reason why the jigs themselves are smaller in size.
i have more, they're in my vest, too lazy to dig em out. These guys are just stock for the soldiers missing in action.