Starbar Inhibidor Insecticidal Pour-OnFeaturing three active ingredients, this pour on fly control for cattle and calves provides control of chewing and sucking lice, kills horn flies on cattle as well as horse flies and deer flies. Ready to use as a pour on Active ingredients Diflubenzuron, Piperonyl Butoxide, and Lambda cyhalothrin Combination of insect growth regulator, adulticide, and synergist May be used only for pour on application to beef cattle and calves, indoors or outdoors