These are containers for storing cooked rice in the freezer and reheating it in the microwave. They were very convenient, but I am selling them because I no longer need them. --- Product Description Details Set includes: 6 containers, one serving: approx. 220g Weight: approx. 70g (per container) Microwave heating time: 500W | 3 minutes 30 seconds *Please note: Avoid sudden temperature changes, such as pouring cold water on the heated container and lid. This may cause deformation.