Main Material: [Bag] Silicone Rubber, [Lock Bar] ABS Plastic
[Bag] Heat resistant temperature: 220 degrees, Cold resistant temperature: -60 degrees, [Lock bar] Heat resistant temperature: 60 degrees, Cold resistant temperature: -20 degrees
* When heating in a bain-marie or in a microwave oven, be sure to remove the lock bar and heat it so that it does not become sealed