This is a glass carafe. As shown in the 5th photo, the part where air and wine come into contact is very narrow, so the taste of the wine does not change much over time. I have used a type that removes air with a pump before, but it was not very effective. Types that use argon gas are expensive because argon gas is expensive, so they cannot be used for inexpensive daily wines. The structure is simple, so there is less effort to wash it. (Important points below) I don't know if it was there from the beginning of purchase or after purchase, There are lines on the top lid. Please check photos 8 and onwards. I believe it is a seam from the molding process, but please refrain from purchasing if you are concerned. We do not accept returns for this reason. ----Product Description Below------ Enjoy Wine More – Enjoy a glass of wine without worrying about wasting the rest of the bottle, keeping your wine fresh for up to 7 days. Savino creates a new environment designed to easily preserve and serve wine. Our glass decanter creates a barrier between the wine and air, keeping red and white non-sparkling wines fresh after a glass. Elegant and Easy to Use – Our stylish wine preserver holds up to 750ml, and its slim design is the perfect height to easily fit in your refrigerator. Simply pour your wine into the chic glass decanter, insert the air stopper, and replace the lid to save your wine for up to 7 days. Easy and efficient, the Savino Wine Preserver eliminates the hassle of pumps and sprays. Wine Saver Coravin