Material...Ceramic/Pottery Brand...Yachimun In the third photo, the bottom is scraped, but there is no wobble. This is a simple and flavorful bowl. Please refrain from purchasing if you are not able to appreciate the individual differences such as cracks (patterns like cracks on the surface), pinholes (small holes), iron spots (iron particles that have oxidized and become black spots during firing), and unevenness in the glaze, as unique characteristics and expressions of the vessel.