Final All-Weather Blox has a flavor and highly palatable formulation rats and mice can’t resist. Final Blox rodent bait is made with more than 16 human food-grade ingredients for unsurpassed acceptance and control. Final Blox is the preferred bait of rats and mice when tested against other Brodifacoum baits on the market. The active ingredient brodifacoum is an anticoagulant, meaning that when it is ingested, the poison is transferred from the digestive system to the bloodstream where it hinders clotting, causing eventual death.