Made from more carefully selected, prepared, and blended dense stoneware, twice fired at high temperatures to make it strong, hard and nonporous. More durable than other kinds of pottery and earthenware. It can also stand up to the heat from a microwave, dishwasher. Inspired by the attractive karst caves, hence the name karst. The random polka dots and stripes imitate the scenery inside the karst cave. Combined with exquisite reactive glaze process, it can be a remarkable display even an artwork in your dining table and kitchen. Solid but not such heavy crockery and can be stacked very well in the cupboard to save space. They are fully glazed so smooth on the bottom, won't scratch each other when stacked. Color: Gray.