OXO Good Grips GreenSaver Standing Crisper Drawer Insert - 2 Pack Enhanced carbon filter absorbs ethylene gas to keep produce fresh longer Fruits and vegetables give off ethylene gas. Exposure to this gas speeds up the ripening process in neighboring produce in a container or Crisper, causing it to spoil faster. GreenSaver?s all-natural, non-toxic activated carbon filters are filled with nooks and crannies that trap and absorb ethylene gas, slowing down spoilage and keeping fruits and vegetables fresh longer. Carbon filters last 90 days. Activated carbon filter traps and absorbs ethylene gas, slowing down the aging process and keeping produce fresh longer. 360 hole pattern provides proper air circulation from all sides Pyramid shape ensures exposure and airflow, even in crowded crisper drawers Date indicator keeps track of when it?s time to replace the carbon filter Replaceable enhanced carbon filters last up to 90 days 2 filters included