Bluapple Ethylene Gas Absorption w/ Carbon StarterThe Bluapple starter includes 2 refrigerator safe bluapple ethlylene gas absorbers, for produce preservation. This version includes activated carbon for extra odor absorption. Bluapples pay for themselves almost immediately by keeping fruits & vegetables fresh longer. Each Blue Apple lasts for 3 months. Bluapple Ethylene Gas Absorption w Carbon Starter For Food Preservation Refills available. Use Bluapple to keep produce fresher longer! Simple to use.