This is a mug that can cook one cup of rice in the microwave. Besides plain white rice, it can also be used for pilaf and rice porridge, and the instruction manual includes recipes. I purchased it from Felissimo several years ago. I haven't had many opportunities to use it, and it has been stored unused in its box. The material is ceramic, with a diameter of about 13cm and a height of about 12cm. From the time of purchase, there is a slightly thin and rough spot in the glaze on the mouth of the mug (photo 5).