Hareline Slotted Tungsten Fly Tying Beads- Tungsten beads sink fast. Certainly faster than brass bead heads. These beads are slotted so they can be used with jig hooks but can also be used on standard hooks. Hooks and barbs vary, even the same model and size. The clever design of these slotted tungsten fly tying beads solves this issue by incorporating a slot in the bead that allows passage of the barb. 20 per pack.