The PureFresh Fruit & Veggie Saver Refills extend the life of fruits by absorbing ethylene gas from fruits and vegetables, the natural gas that causes produce to ripen quicker. The refills work with the universal produce saver, PureFresh Refillable Fruit & Veggie Saver UFV-2. The Fresh Fruit & Veggie Saver refills includes 4 refill packets and can be placed in your crisper drawer or storage bin to enjoy fresh tasting produce with a longer storage life. Replace every 6 months for optimal performance.