The Sangio wine stopper has excellent airtightness which preserves freshness by minimizing wine oxidation. With the rotary button design for lock and unlock, it ensures that the bottles remains sealed to preserve the wine. Whenever you want to pour another glass of wine, you just need to rotate it again. Great for using at home. This wine stopper preserves the wine just like the original cork, making this a must-have for any wine enthusiast.