Combat Ant Killing Bait Strips are formulated to attract ants quickly – acting as a necessary food and water supply for ants. Its fast-acting insecticide, Fipronil, one of the most powerful ant killers, starts to exterminate ants in hours. Worker ants return to the colony with the bait, feeding it to the rest of the ants, larvae and the queen, killing them in a Domino Effect, eliminating the entire ant colony. Combat Ant Killing Bait Strips are easy to use so place them in hard-to-reach places with no mess.