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Longest residual control of flies of any pour-on insecticide. Field trial studies prove efficacious horn fly control for up to 4 weeks. Effective against horn flies, face flies and biting and sucking lice. Active ingredient, cyfluthrin, is 4 to 6 times more active than older pyrethroid compounds. Solution readily penetrates the hair coat of the animal. Comes ready-to-use, NO MIXING NECESSARY. Can be applied indoors to animals housed in barns or dairy parlors. DOSAGE: 4 ml. for every 4 lbs. CAUTION: No milk withdrawal for lactating dairy cattle