This package comes with 8 -16 oz Just One Bite II Bar baits, and kills roof rats, house mice, and warfarin resistant Norway rats. It was designed to be used in and around agricultural buildings only. Bar pieces fit into burrows and hard to reach areas. The hole allows the bait to be mounted in bait stations, too. | Farnam Just One Bite II Bar 16 oz Bars | Size 8 lbs