Contains 1 - non-toxic trap uses pheromone sexual attractants to lure certain flies (usually filth flies) to their doom.  Can be hung in any area where flies are a problem.  Although the pheromones will not attract some flies, any fly will still stick to the glue if it lands on the surface of the trap.  An alternative to use (for more power) in commercial kitchens is the Flytrap Professional. This trap is only 11 inches long, perfect for window sills and other small areas.