Plastic trays for quick freezing, oven-safe. - Model: K-735 Speed Tray (S) - Function: Quick freezing possible - Material: Plastic - Oven-safe: Oven OK - Frozen storage: Can be cooked in the oven while frozen - Country of manufacture: Made in Japan Features: Made of aluminum with good thermal conductivity and Teflon coating for easy cleaning. Enables quick freezing and thawing, and prevents food oxidation by blocking light. How to use: The lid can be used as a thawing tray for microwave ovens, and the aluminum tray can also be used for heating food in the oven. Stored for a long time unused. Thank you for looking.