Japandi Rustic Serving Bowls are Fired at High Temperature. Smooth & easy to clean. High quality ceramic is thick & durable, long time to use. High temperature fired rough pottery makes it safe & healty,no harmful substances. Simple & natural underglazed colors are rich & bright,unique texture makes tableware more artistic. Microwave oven, oven, dishwasher,disinfection cabinet safe. The bottom is unglazed in order to prevent slippery. Japandi Rustic Serving Bowls-Asian Ceramic Pottery Dinnerware-Japanese Retro Style Salad Dishware-Rough Stoneware