[6Pcs Sourdough Starter Jar Kit] This 6-piece sourdough starter jar kit includes a fermenting jar, a wooden lid, a rubber ring, a silicone spatula temperature paper and a cloth cap, all made of high quality glass, wood, cotton linen, silicone and paper. It is heat-resistant and can withstand a maximum temperature of 150°C for long-lasting durability. [Multipurpose Marking Ribbon and Thermometer Paper] This sour dough starter jar kit includes multipurpose marking webbing and thermometer paper. The marking webbing can mark and locate the fermentation time, and the thermometer paper can read the temperature of the fermented dough at any time, which is very practical. [How to Clean Glass Jars] Put the glass jars in a pot of cold water and boil for 5 minutes, then turn off the heat and leave to cool before removing them for use. Do not boil the water and then put the glass jar. It is also an introductory bread baking tool, perfect as a gift for yeast lovers. Note: Glass jars are heat-resistant, but do not use them hot or cold, you need to warm them up gradually to preheat the jars. [Effortless to Clean and Use] This sourdough starter jar is designed with a wide mouth, making it very convenient to add flour and water and effortless cleaning. In addition, the sourdough starter jar kit comes with a silicone spatula that can be used to stir the inside of the jar and also remove the finished fermented product when needed. [2 Storage Methods] This sourdough starter container has 2 storage methods to choose from. When we need to store it in the fridge for a week or more, we need to use the airtight wooden lid to make sure the food won't spoil, perfect for storing foods such as dried fruits, mixed vegetables, pickles, caviar and canned goods.