The heads of the nymphs play different roles during fishing, they attract fish by their flashes and colours, thanks to their weight they enable the nymphs to sink quickly to the fishing zone and keeps flies in the correct position, where are the most effective.
Tungsten has a specific weight of 18 kg/dm3 , which is nearly twice as much as lead. Therefore, your flies can be significantly smaller and slimmer while maintaining the same weight, and thus much more attractive to fish. Tungsten nymphs are absolutely essential for fishing in deep pools and fast streams.