This is a "Wine Bottle Stopper Champagne Stopper Silver Silver Wine Stopper Stainless Steel." It's a wine stopper used to seal champagne and sparkling wine bottles when you haven't finished the bottle. *For sparkling beverages like champagne and sparkling wine, if the stopper isn't tightly sealed, the pressure from the carbonation could cause it to pop off. This product uses a hooking type stopper for this reason. *Please be careful when opening the bottle after using the stopper, as champagne is carbonated. Also, since it hooks onto the bottle, it may come off if stored horizontally. To prevent it from coming off due to shock, wrap it with plastic wrap after setting the stopper. (We've tested it with several sparkling wines, and some bottles may be difficult to hook onto depending on the shape of the bottle's lip.) The champagne bottle stopper is made of stainless steel and silicone, which is mold-resistant, non-slip, corrosion-resistant, rust-proof, durable, and easy to clean. Size: Approximately 6cm long x 3.8cm in diameter Material: Stainless steel *Shipped in simple packaging.