[Temperature Paper and Rubber String] This package comes with a temperature paper and rubber string that is convenient for easily reading the temperature of the inside fermenting dough at any time. [2 Storage Ways] This sourdough container is available for 2 storage ways. For refrigerator for a week or more storage, it needs to use the wooden lid for a better sealing and keep food from deteriorating. Can be used for storing canned food, dried fruits, mixed grains, , keeping fresh. For fermentation use, use a breathable cloth cover with a strong elastic band allowing the air to flow in and out. Suitable for a natural fermentation. [Wide Mouth and Spatula] This sourdough jar features wide opening that is effortless to clean and convenient add water or flour. And the package comes with jar spatula that can be used for stirring the food stored inside the jar. Also, it can be used for removing the finished fermented fermentation. [Glass Jar Guidelines] Put the sourdough glass jar into the pot with cold water. Boil it for 5 minutes, turn off and cool the glass jar before removing and using. Also, it can be put in the steriliser to disinfect. Please do not put the glass jar in boiled water. Even if the glass jar is heat , it cannot be used in sudden hot and cold situation. Need to preheat the jar first, increase the temperature gradually.