Tomcat Mouse Killer I with refillable bait station contains one tier-1 refillable bait station and 8 or 16 x 1 oz of block bait refills. Effectively controls mice while providing the security of a tier-1 child and dog resistant station. All Tomcat consumer size baits are 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.