NEOGEN RODENTICIDE Havoc XT Rat Bait Block Pouch, 8-Pound Havoc Xt Blok Pouch. Animal Health Supplies Manufacturer: NEOGEN RODENTICIDE D Manufacturer part number: 003-116362 HAVOC XT BLOK 8LB POUCH Kills Warfarin resistant Norway rats and house mice Rats and mice may consume a lethal dose in one feeding HAVOC XT BLOK 8LB POUCH Kills Warfarin resistant Norway rats and house mice