Set of 5 - for up to 20 ounces of your favorite hot beverage
See those shiny metal beans? They're hungry. They LOVE heat. They want to eat up all the extra thermal energy that makes coffee too hot so you can drink it sooner without burning your tongue.
How do they do that? Their polished stainless steel shells are full of a very special phase change material (an ingredient in food) that melts at 140 degrees fahrenheit (the perfect drinking temperature) the molten PCM begins solidifying again, releasing all that energy back into your coffee to keep it at a comfortable and delicious drinking temperature. The more heat you feed your Joulies, the longer they'll keep your coffee warm.