The Tomcat Mouse Killer Disposable Kid-Resistant Mouse Bait Stations include 4 Tier 3 disposable mouse poison bait stations that are each pre pk.ed with a 1 oz. block of bait. Tier 3 mouse bait stations meet EPA standards for resistance to tampering by children and are approved for indoor use. Convenient disposable stations ensure there's no need to touch or handle bait. Simply discard the entire station once the bait is gone. The mouse poison bait stations are made with Bromethalin, an acute, non-anticoagulant active ingredient proven to kill mice faster than anticoagulant baits. Each block kills up to 12 mice, based on no-choice laboratory testing.