This reusable, non-toxic, soft-tack, tungsten-based putty molds easily around your leader or tippet, getting flies down deep and in a hurry. Incredibly popular because it stays where you put it without damaging gossamer leaders or tippet, if you're interested in ditching your clunky arsenal of split shot in favor of something new and better, give Tung-Fu Tungsten Putty a try.