The Python II Livestock Insecticide Dust is an exclusive formulation that contains a flow control agent to deliver a consistent supply of insecticide and will not harden in dust bag if it gets wet. This cattle dust bag is the first “ready to use” synergized insecticide dust for season-long control of horn flies, face flies, stable flies, ticks, keds, lice and other nuisance flies. These fly dust bags for cattle are approved for use on beef and dairy cattle, can be applied to any age of animal, and is an odorless formulation. This fly dust for cattle contains zetacypermethrin and piperonyl butoxide.