The wine is preserved by introducing inert gas inside the bottle. The gases used are food grade Nitrogen or Argon. Both gases are used in the food industry to preserve food and beverages (modified atmosphere packaging), as they are odorless, tasteless and colorless.
Injecting inert gas into the bottle allows the escape of air (containing oxygen), preventing the oxidation of the wine.
In this way, the wine manages to keep its taste and its aromas unchanged for about four weeks. *
* Results may vary on different wines.