content: I have been using this product for a few weeks. I have a ceramic tea pot that I use to make a few cups of tea at a time, and the tea was getting cold way too quickly. This product keeps my whole pot of tea nice and warm for as long as it takes me to drink -- which has been up to about six hours. I'm getting ready to buy a second one for my tea cup, so my tea stays warm once I pour it from the tea pot.