Firehole stones are heavy tungsten beads that are perfect for fly tiers who are looking for a quick-sinking nymph that will catch the eye of the pickiest trout. The painted beads in royal blue, chartreuse, and pink floyd are hot spots under UV light - they glow! Trout see UV differently than we do and the hot spot on any fly can take it to the next level. A gold bead is attractive, but a glowing pink bead is downright irresistible! 36 per package