Traps and absorbs gases from produce to keep spoilage at bayFruits and vegetables naturally emit ethylene gas, which causes premature spoilage. GreenSavers non-toxic, enhanced carbon filters help keep produce fresh longer by absorbing ethylene gas.Features:Traps and absorbs gases from produceEach filter lasts 90 daysSet of 4 provides a year of freshnessCan be used with any GreenSaver productAll-natural activated carbon filter