The specific combination of food attractants for small roaches and the active ingredient, fipronil, provides quick results and the complete protection and control that you need. Combat 12 month roach baits may be used wherever you see roaches. Let combat 12 month roach baits protect you and your family from roaches for up to a year, so you can concentrate on other things. Roaches enter bait station and eat the bait. Roaches take the bait back to the nest. Roaches share the bait, killing other roaches and destroying the nest.