This ultimate Fly Catcher is non toxic, easy to use and very effective. Each trap can catch up to 20,000 flies, the bait is especially appealing to female flies, thus reducing the next generation. Simply hang the fly trap near any hot spots you wish to protect, add bait and collect the flies. Attracted to the bait, the flies then leave the tray, traveling up the cone and can't find their way out. The trap is constructed of UV stable mesh, steel rings and clips with a plastic bait tray and is reusable.