These Coravin capsules are suitable for the Coravin Wine System Sparkling. One capsule is good for preserving around 7 standard bottles of sparkling wine. The capsule preserves the flavour and prevents the bubbles from escaping. These capsules are filled with pure CO2, the same gas that creates bubbles in sparkling wine, to preserve the taste and effervescence for up to 2 weeks. WineOnline.ie offer a 'Total Satisfaction Guarantee' with Coravin - If it is not what you believed it to be, or not fully up to your expectation we will collect it and refund you in full - no questions, no quibbles.