Disposable, just trap and toss, no messy jars to clean. Includes special patented attractant flies can't resist; the exclusive formula combines multiple feeding stimulants with a powerful sex pheromone. Does not contain insecticides. Trap 'n Toss holds up to 10,000 flies. It can be hung or set on the ground outdoors where flies are most active. Easy to use, just pour in attractant and add water.