These spawning ducks from Darts have three times the strength and rotation capacity of standard spawning ducks. The leeches are used for most types of fishing. For example, they can be used when you tie/build your own rods or you can mount them on different types of lures so as not to twist the line. They can also be used for different types of tackle when you are bottom fishing but also when you make your own stingers for jigs.