This is a set of 5 soba choko (small bowls for soba noodles). They have been stored for a long time and haven't been used much. I'm not an expert, but based on the kiln mark on the bottom, I believe they are Mino ware. Diameter: 8 cm, Height: 6 cm, Bottom diameter: approximately 6 cm Full capacity: approximately 200cc. The bowls have a retro and cute design featuring two pufferfish-like fish in a pair. They are smooth ceramic, and the bottom is not rough. Plastic wrap will stick to them.