The fermentation kit for wide mouth mason jars built in date dial, you just need to adjust the dial, And can label with provided labels Mason jar fermenting lids for wide mouth mason jars include 6 pack fermenting lids, 1 extractor pump and 6 food fermentation weights, for wide mouth mason jars to make fermented probiotic food such as sauerkraut, kimchi and pickles with instructions and recipes!!!(jars not included)