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Synergized pyrethroid tags containing Zetacypermethrin plus piperonyl butoxide. These insecticide cattle ear tags are approved for use on beef and dairy cattle, including calves and lactating dairy cows. Use 1 fly tag to control most strains of horn flies for up to 4 months and pyrethroid-susceptible strains of horn flies up to 5 months. Aids in the control of face flies, stable flies and house flies up to 4 months. Controls biting lice and aids in the control of sucking lice for up to 3 months. Use the Y-Tex UltraTagger to apply the insecticide cattle ear tags. Ear damage may result if used in calves less than 3 months of age. 15 gm.