Durable & Safety - Internal use of Stainless-steel, non-corrosive and durable, external made of food-grade silicone (Same material as baby nipple), Dual functions design allows the stoppers to fit snugly and securely inside virtually any bottle to provide a perfect seal. Easy to Use & Clean - Our wine stopper is ergonomic with a cone shaped design are easily inserted and removed and without hassle. also easy to store when not in use. (P.S you can put these in the dishwasher for easy cleaning ) One Size Fits All Your Bottles - Our stoppers are designed to fits virtually any size wine and other bottles (even olive oil and vinegar bottles) with an air-tight seal to prolong and preserve your opened bottles or beverages. Colorful Stoppers - Come with four colors (Red, Blue, Dark Blue and Purple), Our eye-catching colors can be used to match your event's theme and add cheer and brightness to your bottles whether its for everyday use or a special occasions. This product makes a great gift for any wine lover, you can give them as a gift, or keep them around the house for your next party.