Is the cork of red wine wooden?
The most common wine stopper is, of course, the traditional oak stopper. Oak has a good elasticity and can be used repeatedly after the wine bottle is opened;
It's a cork. New materials are available now, too. Novel wine bottle stopper for environmental protection.
Second, tiny cracks in oak material allow tiny amounts of air to enter the bottle. Don't underestimate the slow, subtle oxidation process, which is the main reason to ensure that the wine is stable and gradually mellow and fragrant in the bottle.
