Combat Roach Killing Bait is formulated with food that attracts both small and large roaches, plus the effective insecticide, Hydramethylnon. This specifically designed formula kills common cockroaches of all sizes, including American and German roaches, eliminating the need to buy different baits. These easy-to-use, no-mess baits need no activation. Simply place them down and relax as they continuously target the source of the problem day and night.