(Chem Tech LTD) Prozap Insectrin CS contains 7.4% permethrin and 7.4% piperonyl butoxide. Use as a pour-on, mist spray, or backrubber. When treating dairy cattle, beef cattle, and calves, it effectively controls horn flies, face flies, and lice, plus aids in the control of horse flies, stable flies, house flies, mosquitoes, black flies, and ticks. Apply 2 ml per 100 lbs., up to a maximum of 20 ml. Can be applied as a spray or wipe-on. Repeat treatment as needed, but not more than once every two weeks. Cattle rub: mix 10.5 oz. in 5 gallons mineral oil.