Hello, Zhu. According to relevant information, among Zhu's casseroles made by Yingjing casserole maker Renhe, Zhu's casseroles are the best, the most authentic, well-known, with fine sand and good shape. Yingjing casserole generally refers to Yingjing sand ware, Yingjing sand ware, a specialty of Yingjing County, Sichuan Province, and a symbol product of chinese national geography. Yingjing sand ware has a firing history of more than 2000 years, which is as famous as Yixing purple sand in Jiangsu.