Inert gas prevents oxidation by blanketing the surface of the olive Oil or Wine by displacing the oxygen. It is completely safe and will not affect the flavor. It is a great way to protect your olive oil or wine in your fusti or any other container. Private Preserve is the original inert gas, and has been used by wine and olive oil lovers worldwide since 1986. Net Content 0.34 oz. (9.7g), which is enough for 120 full uses on 750ml bottles (wine bottle size).