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Wide-mouth jam jars are smaller in size. Also recommended for making jar sweets such as pudding, or for dividing jams and sauces. Glass used in common jam and food bottles. (Not heat-resistant glass) If sudden temperature difference (sudden or sudden cooling) occurs above 104°F (40°C). Soda glass is no problem even if the temperature difference is above 100 degrees Celsius (sudden or suddenly cooling) is not affected even if the temperature is above 100 degrees Celsius. Please note that the contents (jam, etc.) and the temperature difference between the bottle may cause damage. Please note that it is not microwave or oven safe. Twist caps and screw caps may cause deformation and rust if placed in boiling water or boiling water, so please do not disinfect boiling.