This mug is handcrafted by artisans in a workshop in Uruma City, Okinawa Prefecture. The cobalt blue color evokes the sea of Uruma, Okinawa. You can enjoy the warmth of handmade craftsmanship and the refined expression of the sea. Microwave and dishwasher safe. It's also great for everyday use. Color: Cobalt Blue Material: Ceramic Size: Height 10cm / Cup Diameter 10cm Please consider this item with the understanding that it has been stored at home.