Food is divided into small portions for individual servings. Microwave oven with lid left on. Rough texture that prevents rice from sticking. Package size: 7.2 x 6.4 x 3.1 inches (18.4 x 16.4 x 8 cm). Package weight: Approx. 0.2 lbs. (0.2 kg). Material: Polypropylene. Country of origin: Japan Storage frozen packs. Can be heated in the microwave with the lid on. You can always have other hampers. In addition to rice, it can also be used to store side dishes. Containers have been processed to be uneven to prevent sticking; Can be used on both sides of the lid. (Recessed lid has rice. Convex lid for vegetables and side dishes. When heating foods with a lot of oils, the container may deform, so please switch it to a plate and heat it.