These jars have 1 quart volume, with a wide mouth. The wide mouth is particularly useful because it makes the jars easy to work with. You can use it for a variety of fermentation projects, like making yougurt, making kefir, (water and milk kefir), pickles, both sour pickles and vinegar based pickles.
The lids have a great seal, ensuring there is no air exchange during fermentation, and during the preserving period, if that's what you need. The jars also have measurment markings with both American and metric volume.
Fermented foods are foods that are transformed through controlled fermentation, by microorganisms. Food fermentation has various objectives such preservation, taste and aroma enhancements, or even obtaining absolutely new foods, or drinks, without any resemblance of the original ingredients.