Melamine, Bamboo fiber. Upper temperature tolerance: 100℃ / 212℉. Dishwasher safe. Do not use in a microwave. When using a dishwasher, please store it in the upper basket to avoid force and weight applied to it. Do not place near open flames. Do not use abrasive cleansers or steel wool. Do not use chlorine bleach. Color and grain of bamboo varies in each item. Some products may have roughness on the surface due to the polishing process to remove sharp parts.