Official 4 pack of Koolernaut Ice Pucks!Just keep these in your freezer and slip them into the bottom of your foam insulator. Guaranteed to make your last drink ice cold!They are designed to fit the bottom your favorite foam insulator for maximum cooling power and filled with a non-toxic gel.Use them 1000s of times just refreeze.Compare these to Beer Blizzard TM they are much bigger and will not leak! Insulator and beer not included :)