Y-TEX Python Magnum Insecticide Cattle Ear Tags are synergized pyrethroid tags containing 10% zetacypermethrin plus piperonyl butoxide. Python Magnum ear tags have up to 62% more stopping power than similar tags. Ear tag fly control is approved for use on beef and dairy cattle, including calves and lactating dairy cows. Use 1 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 Ultra Tagger to apply.