Prowler Rodent Block 4pack - 1lb Bait Blocks. Each box contains 4 x 1lb. slabs which are scored to be broken into 16 x 1oz. blocks. Each 1oz. Block Kills up to 12 Mice, based on no-choice laboratory testing. A single feeding of Prowler Bait will kill rodents in 2 or more days, vs. 4-5 days for anticoagulant baits after consuming a lethal dose