Multifunctional Marker Webbing and Thermometer Paper This sourdough starter jar kit contains a multifunctional marker webbing and thermometer paper. The marking webbing can mark and locate the fermentation time, and the thermometer paper is very practical, and the temperature of the sourdough can be read at any time. 2 Storage Methods This sourdough starter container has 2 storage methods to choose from. When storing in the refrigerator for a week or more, aluminum lids are required to provide a better seal and prevent food from spoiling. Suitable for storing canned food, dried fruit, grains, caviar, pickles, etc. For fermenting use, use a breathable cover to allow air in and out. Suitable for natural yeast fermentation. Effortless to Clean and Use The package is equipped with a silicone spatula, which can be used to stir the food stored in the jar. It is easy to take out fermented sourdough. Plus, the yeast fermenter has a large opening for effortless cleaning and convenient addition of water or flour. Reusable This sourdough starter jar kit is made of high-quality materials, glass, aluminum, cotton linen, silicone, paper, etc. The glass jar has a maximum capacity of 730ml/25.7oz and measures approximately 8.1cm/3.1in in diameter and 17.5cm/6.8in in height. It is temperature resistant, reusable and durable. Glass Jars Sanitization Tips Put the yeast glass jars into a pot of cold water. Boil for 5 minutes, close and cool glass jars before removing and using. Please do not put glass jars into boiling water. Yeast glass jars are temperature-resistant, but you need to gradually increase the temperature and preheat the jars first. Do not place yeast glass jars in a sudden hot or cold environment.-