Synergized formula contains 7.4% permethrin and 7.4% piperonyl butoxide. Can be applied topically to livestock and their premises. Can also be diluted for back rubber applications on cattle. Lactating and non-lactating dairy cattle, beef cattle and calves Controls lice, horn flies and face flies also aids in control of horse, stable, house and black flies, mosquitoes and ticks. Controls horn flies up to 6 weeks after application.