(BC410) Have you ever put a beer in the refrigerator and came back later thinking that the beer was cold and ready to drink, only to find after opening the beer was still to warm. These new cold activated caps will eliminate that from ever happening again. Here is how they work. Once you place your beer in the refrigerator the cap will start to turn from a light gray at 46 deg to all blue once the cap reaches 41 deg. Simply amazing. These bottle caps also have a special liner in them that will absorb the oxygen out of the head-space of your bottles. This will help your beer and soda pop to retain their flavors during storage. Fits beer, pop and most champagne bottles. Any of our bottle cappers will work with these bottle caps. Comes 144 per bag.