Python Dust Livestock Insecticide 2 lb Horn Flies Ticks Cattle Horses Shaker CanPython Dust is the only dust to contain two novel active ingredients for maximum efficacy against all major livestock ectoparasites. Zetacypermethrin is a 5th generation pyrethroid highly active against horn flies, face flies, ticks, and other pests. Piperonyl butoxide is a mixed function oxidase inhibitor that helps overcome metabolic resistance in insects and synergizes the zetacypermethrin for maximum efficacy and residual activity. Photostable