Six ready-to-use moisture resistant poison bait blocks - mouse and rat bait stays fresh in damp or wet weather. All-weather block bait poison fits in The Big Cheese Rat and Mouse Bait Station (STV179); a tamper-resistant bait station must be used by law when baiting for rats and mice. Suitable for use indoors in the home or outdoors around buildings. Effective rat and mouse killer which tackles household rodent infestations. Contains difenacoum.