This 500 mL yeast starter reagent bottle is a must - have for homebrewers and brewing enthusiasts. Use it to make and store yeast starter wort. Simply mix DME and water, boil in the microwave, and refrigerate. The bottle is made of borosilicate glass, which can handle rapid temperature changes without cracking. It's great for anyone who loves brewing their own beer and wants an easy way to prepare and store yeast starters.