Description Proven effective for pest control, Y-Tex XP 820 Insecticide Ear Tags work quickly to provide your cows relief from all horn flies including the pyrethroid-resistant and organophosphate-resistant strains. The tags provide relief from face flies and control more tick species than any other insecticide tag. Highly efficient, these plastic tags contain a unique a unique chemical class, macrocyclic lactone, ideal for tag rotation. Benefits include increased weight in tagged, growing animals and increased weaning weights of calves from tagged cows. Does not have an unpleasant odor. Includes 20 tags with buttons. Controls: Horn Flies, Gulf Coast Ticks, Spinose Ear Ticks