Coffee Joulies are small, stainless-steel capsules of phase change material designed to be placed in a covered, insulated container cup of coffee to keep it at a drinkable temperature for a longer period of time. They came out of a Kickstarter project launched by Dave Petrillo and Dave Jackson in Tahoe City, California. The project was at 300% of the target funding level by April 1, 2011. As of 9 April 2011, the project had raised $128,000 by 2200 backers, while the original project target was only $9500, and the dies for stamping were expected to cost $20,000.