Just One Bite !! Bars are for getting rid of your roof rats, house mice, meadow voles, and other rats as well. The rats and may may ingest a large enough dose in a single feeding. Just One Bite !! bars are made with grains and seeds and they have ridges to encourage chewing. The individual bars of which there are 8 in a box can be broken up and placed in multiple locations. The come wrapped to maintain their freshness. Each bar weighs approximately 1 pound and there are 8 bars included here.