The Pek Preservino argon gas cartridges can be used on any Preservino wine preservation product to help preserve your open bottle of wine for a week or more. Each argon gas cartrdige preserves approximately 15 open wine bottles and works by flooding your wine bottle with inert gas. Use recommended bottle stopper and place your bottle in airtight chamber. Pek not only prevents oxidation but it controls the temperature of your wine with ease. Set of 4 Argon gas cartridges. Note: Actual life of cartridge will vary depending on the amount of wine left in each bottle being preserved.