It's a glossy black glaze. It's applied over a Shinogi pattern. The lines on the back are from the cutting wire, not cracks. It holds a considerable amount. Ice too. For many uses, such as juice, beer, and alcohol. The last photo is an image. Height: 12.3 cm Diameter: 8.7 cm #WhiteRabbitOriginal #HandmadeForSale #PotteryForSale #InabaNoShirousagi #HanakoIshikawa #inaba1115 #Yakimono (Pottery) #Pottery #Peace