Topic summary
Wine stopper

Extracted from the Wikipedia article Wine accessory.
Stopper
Wine stoppers vary in shapes, sizes, and materials. The three typical types are the cork wine stopper, rubber wine stopper, and plastic wine stopper. All these wine stoppers look very different, especially the top. The top part can be made from plastic, wood, or even precious metals and crystals. However the bottom part of the stoppers are primarily made of the above 3 typical materials, and newer versions of wine stoppers are made to expand in the wine glass to ensure a tighter seal. Some wine stoppers can be vacuum-sealed with a hand pump, to remove oxygen from the bottle, thereby extending the life of the wine by several days after opening the bottle.