Prozap Screw Worm Ear Tick Spray kills screwworms, flies, and maggots in and around superficial wounds affecting beef cattle, horses, and sheep. Offers protection from pests when castrating, docking, branding, dehorning, etc. Protects beef and dairy cattle, sheep, hogs, and horses from attacks of stable flies, horse flies, deer flies, horn flies, mosquitoes, ticks, and gnats. Repeat treatment when flies are troublesome. For ear ticks, spray directly into ear. Controls blood sucking lice on swine. Prozap Screw Worm Ear Tick Spray contains .50% permethrin.