Bayer - For Use On Beef And Non-Lactating Dairy Cattle To Control Face Flies, Horn Flies, Gulf Coast Ticks And Spinose Ear Ticks. Effective Against Face Flies and Pyrethroid Susceptible Horn Flies for up to 5 months. Kills and Repels Face Flies - mechanical vector of Moraxella bovis bacteria causing "pink eye" of cattle. Synergized for extra performance.