CyLence Ultra Insecticide Cattle Ear Tags are for use on beef and dairy cattle (including lactating) to control horn flies, face flies, Gulf Coast ticks and spinose ear ticks. CyLence Ultra Insecticide Cattle Ear Tags are effective against face flies and and pyrethroid-susceptible horn flies for up to five months. It's a synergized fifth generation pyrethroid insecticide (beta-cyfluthrin) that utilizes the Allflex Universal Total Tagger