A humane way to repel mice by the use of natural essential oils conveniently packaged in packs that can be easily placed where needed. Try placing them where mice feed and congregate such as: garages, storage sheds, barns, basements, woodpiles, attics, campers, stored boats, behind appliances, stored pet food and other areas where they may be a problem. One pack treats an average size room and you can increase the number of packs as needed, until desired results are achieved. These are biodegradable packs comprise of peppermint oil, spearmint oil and crushed corn cobs. Each 1/2 oz. pack measures: 3 1/2” x 3” and can repel mice for up to 30 days or more. Package of 4.