simplehuman Odorsorb Trash Can Odor Filters, 2-Pack Charcoal filters naturally absorb odors; 2-pack Adhesive backing attaches to underside of your trash can's lid Can also be used inside a cabinet door or any clean surface area where there are odors Each measures 2/5 by 3-2/5 by 4-2/5 inches After extended use, the filter's odor absorbing ability can be recharged by placing it in direct sunlight