"The lids have a date dial on top that is just Brilliant! So easy to use, just dial in the date you start your ferment. The lids are available in different colors so you can distinguish one ferment from another - it's fun to add extra flavors to make it hot and spicy! Comes with 2 glass weights (you might want to order extras like I did). Very easy to use, very easy to clean. Dishwasher top rack didn't affect them adversely. They came highly recommended to me and I am highly recommending them to you!"