I purchased and used these in January 2025. Goku (Extreme) Frozen Rice Container, Small, 4 pieces [Microwave Heating Time Guide] Small serving (approx. 100g): About 2 minutes 20 seconds at 500W Material Details: Material: Polypropylene Heat resistance: Approx. 140°C Cold resistance: Approx. -20°C Capacity: Approx. 160mL Size: Approx. 124 x 46 x 72mm Country of origin: Japan For those who understand that these are used items, thank you. Small serving, less, small, rice storage container, frozen rice container, rice storage container, rice, frozen, container, frozen lunch box, easy to wash, freshly cooked, divided, dishwasher safe, microwave safe, microwaveable, stylish, simple, frozen storage, made in Japan