This is a traditional Japanese ceramic sake cup (often called an ochoko or guinomi). It features a textured, speckled dark glaze paired with abstract, hand-brushed white accent bands wrapped around the middle. The sturdy, thick-walled design is perfect for holding either warm or chilled sake comfortably. This type of traditional ceramic sake cup (ochoko) typically measures approximately 2 to 2.5 inches in diameter and 1.8 to 2.2 inches in height (roughly 5 to 6.3 cm wide by 4.5 to 5.5 cm tall). It has a standard fluid capacity of about 1.5 to 2 ounces (45 to 60 ml), designed for pouring small, frequent servings as a gesture of hospitality.