Catchmaster® 4 Pack Gold Stick™ Fly & Wasp Catcher. It is designed to attract multiple fly species with its Multi-Bait Attractant. Place traps on window sills or hang them in areas of high fly activity using the included hook. Effective for months, this ready-to-use, disposable, and non-toxic trap is perfect for indoor and outdoor use. Ideal for homes, garages, offices, kitchens, laboratories, stables, barns, and inside garbage cans or containers.