Porcelain. Microwave and dishwasher safe. Do not overheat in the microwave or heat without water. Wash with care. Do not use abrasive cleansers or steel wool. Product size and shape varies in each item due to manufacturing process.
Due to the body and handle being made in one piece, there is a dimple inside of the mug. It is not connected to the inside of the handle.
To remove any stains, soak and wash with baking soda.