【100% New Material】MUUNN slotted beads are made of 97% tungsten, bead head will sink fast. Tungsten is much denser and harder than brass beads. Slotted tungsten beads for fly tying 【High Performance】The fly tying slotted tungsten beads have a perfectly smooth and shiny surface making your bait more attractive to fish. Use these beads for beadhead nymphing and they will sink much faster than traditional brass beads,If you want to weight a nymph without making it bulky then tungsten is the bead for you 【Slotted Beads】 MUUNN tungsten beads are the best solution. The slotted opening is excellent for all kinds of fly hooks, including jigging hooks, which sink quickly and deeply. When you compare it with "cheap" tungsten/brass beads, it is easy to see the difference.