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Steel caps with a unique cold activated finish - when the cap is 41 degrees F. or colder, the paint on the cap turns blue and its says "Ready to Drink" and shows a beer glass with foam. The bottle on the left is warm and the the bottle on the right is under 41 degrees and displays "Ready to Drink". Bag of 144.
I bought these caps for giving brew to my friends and they all love that they are idiot proof. They definitely let you know when your beer is drinkable. They might look like a novelty item but they are high quality steel. Haven't had any failures yet using them. This is my second order.