Specifically designed for the Coravin System, each pressurized Coravin Capsule contains argon, a naturally occurring inert gas that winemakers have been using for years to protect their fine wines. The proprietary seal ensures that even weeks or months after initial use, the Coravin System is ready to use and not out of gas due to leakage. Each capsule allows you to access up to 15 glasses of wine (5 oz. pours).