Tomcat Mouse Killer II is available in a two-pack or four-pack which includes (two or four) tier-3 disposable mouse bait stations, pre-packed with 1 oz block of bait. Tier-3 stations meet EPA standards for resistance to tampering by children and are approved for indoor use. Convenient disposable stations no need to touch or handle bait, simply discard the entire station once bait is gone. Made with Bromethalin an acute, non-anticoagulant active proven to kill mice faster than anticoagulant baits. Each Block kills up to 12 mice, based on no-choice laboratory testing.