Eagle Claw Tungsten weights are insert-free to allow greater sensitivity and easier line threading, particularly of thicker diameter lines. Environmentally safe, lead-free weights are 95% tungsten and 5% nickel. Since tungsten is much heavier and harder than lead, you can downsize your offerings, keep contact with the bottom, and increase sound attraction! Eagle Claw bullet shaped Worm Weights slip through cover naturally, with a concave base to cradle the worm in place.