These Pro Drop Shot Weights are made by Eco Pro Tungsten and are cylinderical in shape for the very best performance and less hang-ups. Tungsten is smaller and denser than lead so you'll be getting a weight that is super sensitive. Feel everything on the bottom and detect more strikes. No worries when it comes to tying them on because you don't have to! Simply insert the end of your line inside the clip and pull up. Your line is now securely attached and you can quickly get your line in water without a lot of hassle.