Block Bait Rodent Killer from The Big Cheese ULTRA POWER range is a fast-acting rodent poison that KILLS RATS and MICE IN ONE FEED. With single-feed bait technology like the professionals use, this powerful formula combines proven palatability with the most potent active ingredient available on the amateur market to deliver fast and effective control of rodent pests. The moisture-resistant blocks will stay fresh even in wet weather conditions, and their universal design makes them suitable for use in all baIt istations. We recommend The Big Cheese Ultra Power All-Weather BaIt istation, which can be purchased separately. A tamper-resistant baIt istation must be used by law when baiting for rats and mice.