Bloks contain 0.005% brodifacoum to kill warfarin-resistant rats & mice. Havoc provides extra protection against accidental ingestion with Bitrex - the most bitter substance in the world to humans. Kills in a single feeding; death occurs 4-5 days later, so rodents do not associate fatal symptoms with the bait. Approved for use in & around agricultural buildings.
XT Bloks feature an easy-to-eat shape that rats and mice will love to gnaw on.