These are ceramic, and I believe they are Kasama-yaki ware. Each plate weighs about 340g to 360g, making them very light. Similar-sized, general-purpose plates would likely weigh around 500g. I'm selling them because I don't use them often. They look great with Japanese food. Would anyone interested like to have them? I've used them a few times after applying kanyu-dome (crack prevention), so there is some wear and tear, and there are slight differences in the texture of the plates. They all have slightly different appearances, which gives them a nice feel. - Color: Dark brown, almost black - Quantity: Set of 5 - Material: Ceramic Outer diameter: Approximately 22cm Inner diameter: Approximately 19cm Base: Approximately 15cm They are shaped like slightly deep curry or pasta plates. I believe they are not dishwasher or microwave safe. Thank you for looking.