Prozap Screw Worm and Ear Tick Aerosol is a multi-purpose, permethrin spray used to control insects on beef and dairy cattle, sheep, goats, hogs and horses. Contains a violet marking dye for use on wounds to identify treated areas and uniform coverage. Designed to kill and repel flies and fly maggots, and ticks (including ear ticks) on livestock. | Prozap Screw Worm Ear Tick Aerosol Spray Wound Care | Size 12 oz