Keep your fermenting food items submerged by adding this glass weight to the jar. For a successful fermentation or pickling, you'll want to make sure all of the food product remains below the level of the brining liquid. This will keep your veggies in an anaerobic environment where the "good" bacteria can work its magic and prevent mold growth. Simply fill and pack your jar with your food item(s), fill with brine, and place the glass weight on top before sealing the jar. When you're done, the convenient finger grips molded into the weight allow you to easily remove it from the jar. Compatible with standard wide-mouth mason jars.