Python Dust is an environmentally friendly dust for use on lactating and non-lactating dairy & beef cattle, sheep, goats and horses. The Dust controls horn flies, lice, ticks and keds. Aids in control of face flies, stable flies and other nuisance flies. Python Dust can be applied on any age of animal. Active Ingredients: Zetacypermethrin & Piperonyl Contents: 12.5 lb.