Rat and mouse Bait Chunx. Contains Bromethalin, a potent acute toxicant. Rodents stop feeding after eating a toxic dose so more rodents are controlled with less bait. Kills anticoagulant resistant Norway rats, roof rats, and house mice. Ideal for use in and around agricultural buildings and homes. All-weather, 1 Oz. block is mold and moisture resistant. Rodents like to gnaw on the multiple edges. Can also be used in a secured bait station.