When you stop drinking,dust may sneak into beer bottle, this beer bottle caps can become an effective tool to solve this problem. Put it on a beer bottle and it will turn itself off. Pick up the bottle and drink, and it will automatically open. This beer bottle cap is made of food grade PP material, which is of high quality. Automatic bottle caps can be reused many times and can be removed for cleaning when not in use. If you take good care of them, they will last a long time. This smart fully automatic beer cap design fits most standard beer drink glass bottles. Automatic bottle caps create a tight and secure seal on the bottle, preserving carbonation and preventing leaks, ensuring your beer stays fresh and delicious.