Tungsten putty that is applied, adjusted and sinks quickly.

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.
Tungsten putty weight
Non-toxic
Non-lead
Reusable
Charcoal color
Can be used as temporary bead head for nymphs
20 grams