Tomcat Rat and Mouse Bait Place Pacs are a proven, versatile way to control rats and mice. They provide economical control using the active ingredient Diphacinone, a multiple feed anticoagulant that has delivered proven results for more than 25 years. Ready-to-use Place Pacs are pre-measured with 3 oz of pelleted bait, and keep bait fresh by protecting the pellets from contamination by odors, dirt, and moisture. Great for putting bait in tight spaces and hard to reach areas.