THIS ITEM MAY ONLY BE SHIPPED VIA GROUND Contains Muscamone, a powerful fly attractant that lures flies to the bait. Flies die rapidly after feeding on it. Homogenous formulation ensures uniform effectiveness in every dose. Approved for use as an outdoor scatterbait, as well as indoors for use in caged layer houses. Flexible application methods - can be applied directly from the package or in bulk from spreaders.