Keep produce fresher for longer with OXO GreenSaver activated carbon filters. Fruits and vegetables naturally emit ethylene gas, which accelerates ripening and leads to faster spoilage. These all-natural, non-toxic filters feature a porous structure that traps and absorbs ethylene, helping maintain freshness in your container or crisper. Made from coconut-based carbon and BPA-free materials, the refills work exclusively with OXO Good Grips GreenSaver Produce Keepers and Crisper Inserts. Each pack includes four filters to keep your storage system performing at its best.