The lunch box and rice cooker are made of tightly packed, straight-grained cedar. Cedar's moisture-regulating properties absorb excess moisture and provide moderate moisture, so rice doesn't get sticky and has a rich flavor, making it delicious even when it cools down. In addition, because it is unpainted, it is breathable and the rice does not spoil easily. Cedar is also said to have antibacterial properties.
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Click here for a list of works by Tamaki Hakata Magemono
https://kougeishop.com/category/hakatamagemono/