The bento box and outer lid are made of PET and ABS plastic (safe temperature range: -20°C to 140°C (-4°F to 284°F)) and are dishwasher safe. The inner lids are made of polyethylene (safe temperature range: -20°C to 60°C (-4°F to 140°F)) and should be handwashed.
The box is microwave safe with the inner and outer lids removed. (Use only for heating up food, say for 2 minutes at 700 watts, not for long-duration cooking!)
Do not place in the oven or near an open flame.
Made in Japan, in Ishikawa by Hakoya.