Insert cork into the bottle and draw the air until the rod pops out. This slows down the oxidation process and keeps the wine fresh. A simple wine stopper can bring longer storage time to the wine.The wine stopper is made of 100% food grade silicone.The material of the bottle mouth is aluminum. It will not harm the wine, it will not change the taste or smell of the wine and will keep your wine perfect. The wine protector is easy to clean and always stays clean.Wine bottle stopper, exhaust pipe design, easy to reopen the wine bottle, or clean the wine bottle.