CONTRAC Meal Place Pacs contain the single-feeding anticoagulant, Bromadiolone, and come in slender pre-measured place pacs that keep bait fresh and free from dirt and contaminants. Proven bait acceptance with CONTRAC Rat & Mouse Bait is due to its highly palatable meal formulation. It is an excellent clean-out and maintenance bait to control mice and rats, including warfarin-resistant Norway rats. Meal baits, while the least weatherable bait form, get excellent rodent acceptance because they contain food-grade ingredients, seeds and grains, which give rodents a variety of textures and flavors. Rodents can consume a lethal dose in a single night's feeding.