Now that they are done you can use them how you want. If you are in a hurry and want to cool your coffee from scalding to drinkable in seconds pop in a couple of coffee cubes and you're ready to go. Want to make sure that your ice coffee ratio stays all coffee and no water to ensure that sweet coffee goodness hits your tongue then pop in a couple of coffee cubes. You will no longer have to burn your tongue or water down your coffee. It's cheap. It's easy. It's perfect. I hope you enjoy.