Polypropylene. Upper temperature tolerance: 140℃/284℉. Microwave and dishwasher safe. BPA Free. Made in China. Do not overheat in the microwave or heat without water. When using a dishwasher, please store it in the upper basket to avoid force and weight applied to it. Immediately wash and dry well after use, and keep dry when not in use. Do not use abrasive cleansers or steel wool. Do not place near open flames. Some products may have roughness on the surface due to the polishing process to remove sharp parts.