Convenience store rice balls are not eaten cold. Convenience store rice balls are usually eaten cold and heated by microwave oven, and the heating time is relatively short, and it can be heated in one minute, which is also one of fast food.

The traditional Japanese rice balls are triangular. The rice ball is wrapped in a pickled sour plum (super sour) and wrapped in a piece of dried seaweed, which is very convenient to carry. There is great stress on making rice balls. When you pinch them, you need to touch some salt on your hands. Compared with sushi, rice balls feel more civilian.