Use the Fly Relief Disposable Fly Trap in the yard, kennel, stable, barn, around horses, pets, cattle, hogs, garbage containers or in other areas where flies are a problem. Insecticide-free, the Fly Relief Trap contains an attractant which, when filled with water, draws flies in by the thousands. With a convenient twist-tie for hanging, the bag holds 10,000 flies. Outdoor use only. Sorry, this item cannot be shipped air service.