Prozap 1499510 Insectrin Dust Bag Refill, 12.5 Lb, 2-PackProzap Insectrin Dust Refill contains . 25% Permethrin for use with the Dust Bag for direct application to animals. Controls lice, flies, northern fowl, mites, fleas, and ticks found in bedding, cracks, and crevices. For use on beef cattle, dairy cattle and swine. 2 Pack Size: 12. 5 lbs Insectrin dust bag refill Contains . 25% Permethrin For use with the Dust Bag for direct application to animals. Controls lice, flies, northern fowl, mites, fleas, and