Vertox 25 Oktablok II Rat/Mice Bait Blocks are designed to control the movements of vermin in and around buildings, (inside for rats and mice, around buildings for rats only) offering a solution where other eradication methods have failed. This feed will kill rats and mice, preventing them from breeding further, in a product that is easy to use. Simply use one tub for small to large mouse infestations, one tub for small rat problems and one-two tubs where you have a larger rat problem. PLEASE NOTE THAT IT IS A LEGAL REQUIREMENT TO ONLY USE THIS PRODUCT WITH A BAIT BOX TO PROTECT NON TARGET SPECIES AND CHILDREN