For use on beef and dairy cattle, including lactating dairy cows. One tag per head provides excellent activity against horn flies that are resistant to some other insecticides (up to 4 months) and biting lice (3 months). Also aid in the control of face flies, stable flies, house flies and sucking lice (up to 3 months). Net weight of 15.4 gm per tag provides greater insecticide release for maximum effectiveness Sustained-release plastic ear tags containing a synergized formulation of 5% zetacypermethrin, a potent enriched S-isomer pyrethroid compound and 20% piperonyl butoxide. Patented Snap-Lok™ collar s retention against tag or button failure for up to 4 months.Use UltraTagger Applicator. Royal blue tag.