Python dust kit, includes y-tex A-line dust bag & a 12. 5 lb refill sleeve, only dust to contain 2 novel active ingredients for maximum efficacy against all major livestock ectoparasites, zeta cypermethrin is a 4th generation pyrethroids insecticide with enhanced potency against resistant horn fly strains, the photos table form of piperonyl butoxide is a mixed function oxidase inhibitor that reduces metabolic resistance in insects thus energizing the pyrethroids for maximum efficacy & residual activity.