Very good. Guoguang ceramics is carefully selected, using pure silica, porcelain ore and various precious rock crystal ore materials. All raw materials are carefully selected, ground with high precision and strictly proportioned. Guoguang ceramics is easy to clean, wear-resistant, scratch-resistant, not easy to break, strong thermal shock resistance, using pure natural materials, no chemical additives, products do not contain harmful substances such as lead and cadmium, non-toxic and non-radioactive.