This is a super thin pot that was also made in the Song Dynasty but during this time the capital moved to Hangzhou because the Mongols invaded and sacked the northern Capital and killed the Emporer. The ceramic wall on this pot was almost the same thickness as the glaze that was sprayed on it. Scientist still aren't sure how this was done, but they do know this was a time that the pots were acutally bisqued. I wish we could bisque our pots. We fire everything once and in the green stage.