Details This charcoal-colored nontoxic, Tungsten-based product is biodegradable and reusable, making it an environmentally friendly alternative to split shot and other lead based weight. The weight and depth are easily adjustable, to make sure that a nymph always finds the bottom. Features: Tungsten putty weight Non-toxic Non-lead Reusable Charcoal color Can be used as temporary bead head for nymphs