Improves casting distances and they can be taken off and used again and again. The weight makes a soft plastic jerk bait 1000 times more effective as you can get the bait down into the strike zone without using, action killing jig heads. It allows the lure to maintain a horizontal drop. They are made of soft lead and you can bend them with your fingers to fit the contour of the hook. 8 per pack, all weigh 1/8 oz.