Tomcat® is tougher than a barnyard cat for controlling rats and mice. Tomcat® baits are manufactured with human food-grade ingredients and enhancers, for a bait so palatable that rats and mice can't resist. Containing the anticoagulant diphacinone, Tomcat® is an economical, multiple-feeding bait that kills rats and mice in 4 to 6 days. Tomcat® Rodent Blocks can be used in all baiting stations. Tomcat® Rodent Block is mold and moisture resistant. Patented gnawing edges give rodents plenty to chew.