【Durable Material】All the metal parts of our swing top are made of stainless steel, the red gasket is made of food grade silicone, and the white plug is made of safe and sturdy ABS plastic. | 【Fit For 17mm-22.4mm ID Bottles】If your bottle's mouth internal diameter is between 17mm-22.4mm and has indentation 14.7mm below the bottle's mouth, our AIRTIGHT sealing swing cap would be perfectly fit for you! Our swing top bottle caps featured as strong locking, durable long life, nice looking, glossy finish and well made craft! These little flip tops would be the best patner of your homebrew! | 【No Leak & Double Service Life by Extra 12 pcs Gaskets】 Our swing caps have very tight seal and there's no liquid will leak. At the same time ,we will send 12 pcs extra red gasket to you. The red silicone gasket is removable, reusable and can be replaced by our extra 12 silicone seal gaskets, this will definitely extend the service life of our swing caps! | 【Easy To Open & Close】 Open: Catching the edge of the stainless steel hasp, push it up, and then the silicone plug will automatically bounce. Seal: Align the silicone plug with the bottle mouth, push the stainless steel hasp down , and then the silicone plug will tightly locked with the bottle mouth. Our flip top stoppers are made of premium materials, normal daily use of open & close, install & remove will not cause any strains on this swing top classic caps. [dishwasher safe] | 【Perfect for Homebrew】 Our high quality swing cap is frequently used for bottles contains carbonated beverages, such as beer, kombucha, water kefir, limoncello, soda and so on. Easy to use, Easy to clean, reusable for hundreds of times, 100% seal to keep fresh, isn't it great? Come and get a great way of keeping your homebrew fresh!