Tungsten Putty provides a non toxic, pliable weighting system that can be applied in seconds, moulded to any shape and is fast sinking with uses for all fly fishermen. Use on flies, braided loops or nylon and moulds to any shape. Warm by rolling putty in the hand to make it more flexible. Pinch of the required amount, flatten between thumb and forefinger than apply by rolling around leader or hook shank. Stiffens in water - sticks to even fine nylon - non toxic - reusable - no affect on breaking strain - very high density.