Farnam Rodentex Multi-Feed Bars rodenticide kills Norway rats, roof rats and house mice in and around homes, and commercial and agricultural buildings. Multiple-feeding, all-weather bait bars kill rodents in just 6-8 days. Highly palatable, high oat content with low bait shyness. Mold and moisture resistant. Scored to be easily broken into 16 one oz pieces. For use indoors or outdoors, and in bait stations. Contain 0.005% diphacinone. For Rats - 4-16, 1 oz pieces per placement, spaced 15-30 ft apart; For Mice - 1-2, 1 oz pieces per placement, spaced 8-12 ft apart.